Build: First of all, the build quality on this machine is EXCELLENT. Having never owned any asus product, I'm seriously impressed at the build quality on this thing. Even though I only paid $899, this feels like a $1500+ machine. The aluminum finish is fantastic and feels really good. I will say it's a bit of a fingerprint magnet, but that's nothing a quick wipe with a cloth won't fix. Also, since Amazon doesn't disclose this, the ASUS logo on the front lid is BACKLIT. Some reviewers have knocked on the weight a bit, but for everything you're getting, it's a non issue. Unless you weigh about 30lbs, I don't see how you could knock on the weight.
Keyboard: The keyboard is great. I very much enjoy the feel of the keys and the response is excellent. Even for someone with big hands like me, I have no trouble typing at full speed. Also, this keyboard is BACKLIT for those of you not sure, and it looks great in the dark. You can also adjust the level of brightness as you see fit.
Touchpad: Wasn't too happy with this at first but I've grown to like it. I'm a big fan of the pinch to zoom and all the other features it comes with. Yes, sometimes you might not get the exact response you want or you'll accidentally zoom in on something, but the touchpad is great. No regrets and no serious complaints.
Performance: Initial boot up takes a bit, but even with all of the bloatware ASUS puts on this thing, it's pretty fast. The i7 along with the 6GB of RAM really makes navigating through all programs a breeze and I've no freeze ups or noticeable lag. I plan on installing an SSD sometime in the near future and doing a clean install but for the average user, there shouldn't be any performance issues.
Graphics: As some reviewers have previously mentioned, you are using dual cards for graphics. The laptop uses the Intel 4000 for non extensive actions and the NVIDIA for heavy graphic tasks such as gaming. I don't really plan on gaming at all so this is perfect for me. But from what I've read, gaming shouldn't be an issue.
Display & Sound: The display is AMAZING. Videos, websites, programs......everything looks excellent. Hands down the best display I've used on a Windows machine. I would highly recommend pushing for 1080p if possible. The sound quality for a laptop is amazing. It's loud and clear. I've just started doing insanity workouts and using this and the sound and look of everything is amazing. No complaints at all. I haven't used the included speaker, but I'll get around to it. Webcam is also nice and clear and video chatting is no issue. Other party can hear me loud and clear with no echo.
Overall, I am completely satisfied with my purchase.