The included WiFi is pretty crappy. I was getting 3-5mb/s over my network, and poor connectivity in my bedroom, which is usually not a problem.
I ordered an Intel 6235 WiFi card for $23 here on Amazon. Windows8 didn't even need drivers. I am getting 50+mb/s and great connectivity on 2.4GHz, and the 6235 has 5GHz too.
(Installation is cake. unscrew the bottom, swap the card, screw back up. 5m)
Yes, 4GB is soldered onto the motherboard. You can upgrade to 8GB, although you have to take the whole bottom cover off the ultrabook to install the RAM. crucial.com has a 4GB stick of RAM that is compatible. Part #CT3679802.
Short answer: Yes. I did it and it works great.
Long Answer: It's not simple, especially if you are upgrading to a smaller disk.
1) Create a recovery disk/thumb drive with the Windows Utility. Besides being a good idea, they offer you the option to delete the Recovery partition from the back end of the drive. Doing so will allow you to more easily manipulate the existing partitions for transfer.
2) Delete the blank d: Data partition. I am not sure why they break it up like this. Possibly shrink the System partition (I first went to a 128GB drive, then to a 256).
3) Unscrew the bottom, remove the drive (REAL SHUT DOWN FIRST!!!)
4) I tried to use Clonezilla to duplicate the drive, but this didn't work so well. So I ended up using a simple dd command in linux. If all this is beyond you, just find a local geek to help.
5) Plugged in the new drive, screwed it all back up, and it worked!
ONE ISSUE!!! Upon reboot, Windows thinks it's a special version called Windows To Go, and won't let you install from the MS Store.
Here is the solution:
yes, I get a weird blob in the middle of my screen about half the time I carry in a backpack (also inside an additional padded laptop case). The blob slowly shrinks in time over a couple days, but then shows up again when I carry in the pack. Very odd...
It has no bluetooth. It's surprising nothing has been done by either ASUS or Amazon: fix the misinformation or compensate the customers. Honestly it's a good computer for its price. Also it seems easy enough if you want to upgrade to BT capacity.
Until now it has been very durable, and working flawlessly. I have several asus products and this one is as sturdy as the others except less expensive. It have been a great purchase. Mainly wifey uses it and other than having to get to know window's 8, the product has no issues