Only been using it since this morning when I picked it up at Best Buy, but so far everything has been about as expected. After you've used hundreds of tablets and notebooks, combined with many pictures & videos, not much is going to be a "surprise" at this point.
So not going to echo the other reviews about how thin and light it is... etc; so I'll note what has stood out for me, and perhaps not mentioned quite as much. First, this is the i5/256/8 version, and ambient temps were about 80F. It's on AC power, charging, balanced mode, and OS is fully patched.
During initial setup as I'm copying files over a gigabit USB adapter and installing some apps, it gets quite hot. Noted 108 degrees at the top/right side of the screen, and a tad warmer on the opposite side, at the back. CPU core temps hit around 170 at that time, so not bad.
As a result of the extra work called upon it, that little CPU fan gets super noisy. Even with a high-end workstation and air cleaner nearby, it's quite audible. Mostly due to it's higher pitch noise. It is a small high RPM fan after all.
Also ran a 3DMark11 Cloud Gate test. Core CPU package temps peaked at 91 C/195 F.
Now that it's fairly idle, and I'm typing up this post, I'm looking at about 49 C/ 120 F for the CPU. And no more fan noise. Although if I put my ear to the vent, you can hear a faint buzzing noise from the fan. Once again, it is rather intentionally warm in here.
I have noted once or twice that the keyboard/touch-pad didn't respond right away, after some inactivity. And there is a very small amount of light bleed at the top of the display. Unfortunately rather common with IPS displays, and once again, minor.
Beyond that everything has met my high expectations for a tablet/ultrabook replacement. I'm optimistic it will succeed. The real test will be as I take it on a week long flight in a few days as my only "computer" type device. Well, other than my phone.