Cons: wifi, until I fixed it - or it fixed itself.
First off, Best Buy got this to me in 3 days, with the free shipping. Very impressive. Right out of the box the UX31 was as aesthetically pleasing as I had hoped. I plugged it in, let it charge for an hour, then turned it on for the first time. Went through the process of making a bootable ISO, then left the house while waiting for it to complete. Getting back to the house, the computer is up and running, so I test out the time it takes to wake up, and the time it takes for a cold start. ~2 seconds and ~15 seconds, just like everybody has been saying. My room is situated about 10m from my wireless router (Netgear WDNR series, about 1 year old) and had massive problems trying to connect. After 2 hours of fiddling, I finally got onto a stable connection which then persisted throughout the night - Hopefully when I get home today, it is the same. Could have been the router, could have been the UX, I'm not sure, as my iPhone occasionally has the same problems, but the housemate's wireless-n usb receiver and PS3 never have these problems. Every time it wanted to connect it would ask me to turn on wireless capability. It would work for about 20 seconds and then go out again. I'm not entirely sure how I got the connection to stay good, but I was messing with the FN-F2 button (wifi+bt toggle) and sitting about 3 feet away from my router, then the connection stuck throughout the rest of the night, even when I brought it back to my room. Speed tests from speedtest(dot)net topped out at 11.23 mb/s down and 2 mb/s up, so that was pretty impressive.