I purchased the I7559-7512GRY model with the 4k UHD screen, Core i7, 16GB RAM, and 128GB SDD + 1TB HDD combo and I like it so far, but can't say I absolutely love it. I purchased mine specifically to be a desktop replacement/mobile workstation. I do not do much gaming, but rather, I run a lot of CPU intensive VMs and networking programs, with occasional Photoshop work. So far, it's been incredible value for money. Performance with this laptop is great, the SSD is fast enough for the kind of work that I do and having the 1TB secondary storage is nice, but I think eventually I will swap both drives out in favor of a single SSD. The graphics card on this laptop is a beast and handles Photoshop exceptionally well, and the 4k screen has great color and depth to it, but IMO is too contrast-y.

Things to like about the laptop:
- The combination of i7 quad core, SSD, 16GB RAM, and 4GB discrete graphics makes this laptop blazing fast for the money. It's definitely up there with other laptops that would cost easily twice as much.
- 4k touchscreen is gorgeous for everyday use. Not exactly the brightest screen, but it will do. I have compared it side-to-side with the matte 1080p version, and the 4k simply blows the 1080p version out the water in terms of overall image quality and color reproduction. Touchscreen feature is nice and responsive for the most part. It handles touches very accurately, which surprised me to say the least. Although I hardly use the touchscreen since the glossy texture shows fingerprints very easily.
- Keyboard is nice and quiet, perfect for typing, not so sure about gaming. The keys are decently sized, nicely spaced apart, but the key actuation is very low. There is little to no feedback with each press of the key. Backlit feature is a very nice touch, but there is a lot of light bleed out the sides of the keys and the space bar + the trackpad are not lit. Numberpad is also nice to have as well. Saves me a lot of time in my line of work.
- Speakers are great for a laptop. Subwoofer (if you want to call it that) adds a bit more depth to the sound, but not so much detail. Don't expect too much from it as it is weak at best. I listen to a lot of music and it still sounds very flat on the bottom end. Still very hard to distinguish a lot of different bass notes, but at least the sound isn't as flat or tinny. They do get very loud very easily.
- All 3 USB ports are USB 3.0, 1 of them (the one on the right side) also doubles as a USB charging port as well. This means that any device you plug in gets more than the typical 0.5A of regular USB ports. I'm not sure exactly how much output it has, but it's enough to charge my phone just like my normal wall charger would. It also works when the computer is off, which is pretty sweet.
- Overall construction is fairly nice. The laptop is very sleek looking in all black with the grey accents. Very professional look IMO. The hinges are nice and stiff for the screen. It closes with a nice soft thud. The construction is all plastic, but it still manages to feel very sturdy. Bottom cover to access all internals comes off with just 1 screw, making upgrading the laptop extremely easy and user-friendly.
- Laptop doesn't get extremely hot with all the power it has packed into it. With the two fans and all of the ventilation, the laptop stays fairly nice and cool, as well as quiet. The fans only got loud on me during my Win8.1 downgrade, and boy were they loud. Other than that, working for 3hrs of Photoshop did not even kick the fans up. The underside of the laptop does get slightly warm, but not to the point where it gets uncomfortable.

Things not to like:
- Trackpad is a little disappointing. The size is nice and scrolling is fine, but it gives a very hollow thud with each click and just feels cheap overall. After downgrading to Win8.1 from the stock Win10 OS, I lost a lot of functionality with the trackpad as Dell does not have any trackpad drivers available for this laptop. I had to install Dell ELAN drivers from a different model in order to regain the trackpad functions. Took me a long time searching for the right driver, but I eventually found one that works.
- Battery life is average, definitely not winning any points here though. I can usually get about 5ish hours with normal everyday tasks like web browsing, a bit of music listening, and using Microsoft Office products. Anything intensive such as Photoshop or VMWare will bring down battery life to 3.5-4hrs. Given the size of this laptop, you would think they could stuff a much beefier battery, but oh well.
- Soft-touch plastic construction is an absolute fingerprint magnet. No matter how clean your hands are, this laptop attracts all sorts of greasy fingerprints on it. They're not as obvious due to the matte look, but given the right angle you can see all the fingerprints.
- Although the grey model has grey accents around the Dell logo on the lid and on the trackpad, it still has red accents on the speaker grilles, heatsink fins, and the rubber feet. IMO I think the red looks very tacky and just doesn't flow very well with the overall design. Not something serious, but still bugs me a bit.
- The laptop weighs quite a bit. It isn't advertised as being an ultralight laptop, but at 6lbs for the laptop alone, it is on the heavier side. Throw in the huge brick of a charger and you're looking at around 8lbs. Not exactly the most mobile workstation, but again, it isn't advertised as being an ultralight laptop.
- Does not utilize DDR4 RAM or PCIe x3.0 SSD technology, which is understandable given how new the technology is, but would still be nice to have for future upgrades. At this moment, Dell reserves this technology for their higher end models such as the XPS 15.

These setbacks are minor at most. Don't let them sway you from choosing this laptop because it is still a great laptop overall. It does everything I need it to do without a hitch and it looks awesome. Personally for me though, price is a big deciding factor for this laptop. I paid just under $1200 with tax and shipping for mine because of a discount I received. If I was purchasing this at full price, I think I would have been a bit more biased towards the higher priced XPS 15 model with the sames specs because of the DDR4 and PCIe SSD. If those two factors don't matter to you, then definitely go with this laptop.

I have been doing research on laptops for about a year now. I recently left my full time job as an in-house graphic designer and went out on my own. I had once bought a Macbook Pro thinking it was the best of the best but was sadly disappointed after using it for only 2 weeks and it was VERY slow.

I'm about 3 weeks in to having this one and have installed all of my Adobe programs (InDesign, Photoshop, Illustrator, Acrobat, Dreamweaver) plus downloaded my Dropbox files and Google Drive files and it's running like a dream. I honestly couldn't be happier.

This laptop is like one those souped up, highly tuned cars that don't have any flashy decals or spoilers or whatever, but meanwhile it'll smoke you once the light turns green. This laptop is THAT GOOD.

First, the GOOD:

1. If you're into upgrading your laptop, this has to be the most upgrade friendly laptops I've ever owned; whether it'd be switching out your normal hard drive for an SSD, your good! Ditto with battery, memory, and whatever else. The bottom part of the laptop pops off entirely, exposing it's innards completely.

2. The screen looks AMAZING. I got the UHD touch screen display cuz I figured I'd splurge (it's been years since I upgraded my laptop), and it blew me away. Streaming on Netflix, or watching anything else that supports UHD is mind-blowingly good: the crispness and the details, and things you wouldn't even see on your home TV. It's that good. The touch response it also decent, on par with a high end Android tablet, but no where near an Apple. I mostly use the touchpad anyway (but even that's got a few issues: see BAD).

3. Lighted keypad. This is one those things that you don't think you really need until you have it, makes typing in the dark easier. You can actually dim it too.

4. Blazing Fast Graphics. Given the price point on this bad boy, I couldn't believe how good the graphics were. I play Fallout 4 with no real issues, and to kick it old school I play COD: World at War at the highest resolution with all the sliders in the graphics settings tuned to max. I will admit that you cant do that with Fallout 4: the graphics are a bit better than what you'll see on a 360 or PS4 console, but not what you'd see if you set the graphics to max on a fully dedicated gaming PC.

Now, the BAD.

1. POOR BATTERY LIFE. I mean, that's gonna be a given with a UHD touch display set to maximum brightness. But even with that, battery life is pretty pitiful. Even as I write this, I can literally see the battery meter dropping by a percent every 5 minutes. So you're gonna have to lug around the big AC plug / pack everywhere you go.

2. Medium Screen Brightness. I like my screens bright... like stare into the sun bright, and this display this just barely makes the cut. Even set to max, the brightness might not be enough for some people. Even with me, there have been videos that I wish I could see a little brighter, but, it ain't happenin'.

3. Terrible Touchpad. It's big, it's not very responsive, and it doesn't have any dedicated mouse buttons: it's literally a big credit card sized rubberized plastic box that you have to imagine is a touchpad. Then you have to guess where on this big plastic pad you might find the left or right click buttons, because all it has is a small indentation signifying where each one begins and ends. It's pretty frustrating. I've heard that Dell's usually have this issue, so just know that going in. I mostly use a wireless mouse anyway, so this has sort of become a non-issue.

4. It's BIG, and HEAVY. This isn't one of those "toss into your messenger and take it on the subway" laptops. It's 16 inches and heavy, like 6 pounds heavy, and I'm not including the AC adapter that you WILL need to lug around too to keep it running; THAT also weighs a good 2 to 3 pounds. So that's 8 to 9 pounds total. This is more a desktop replacement, "stay at home" type of laptop, and for me, that works just fine.

So that's it!

A really good (but not perfect) laptop that honestly, grew on me despite whatever "bad" things it might have. That's why, for me, it gets 5 stars, but I should probably give it 4. Every laptop has its quirks, and this one is pretty straightforward and (slightly) intuitive despite them.

If you're into gaming, upgrading your laptop, and need a desktop PC replacement that you can take (sort of) anywhere, look no further!