I finally got my K101 and I want to say a few things about it.
Before I say anything though, I have to admit it took quite a while to get to me. I pre-ordered it all the way back in November, possibly even earlier, so it was a long wait. I was a bit irked but no biggie I guess....
Anyway, overall the feel of the K101 is great, A and B buttons felt a little strange at first but that feeling quickly went away after a couple minutes of use. Menu is very straightforward and decent, and adding files is very simple.
As for playability, so far I haven't encountered any problems with any ROMs, and even though the resolution is different, I don't notice much.
The one thing that reeeeaally bothers me though is this one dead pixel.
When playing games that move a lot like Action games or Platformers, it's barely noticeable, but when playing RPGs or games with lots of text, it can be really annoying since it's just floating in the text box.
I guess if you are playing a game with darker text boxes or option to change the color like Final Fantasy, it becomes less of a problem, but it is still kinda annoying.
Overall though I am quite satisfied.
EDIT: I don't know if I should be more dissapointed or not but, those "dead pixels" weren't really dead pixels at all, only specks of dirt or whatever it may be under the screen. I tried opening it up to get to the screen, but the motherboard was in the way and I didn't want to mess with that, and in the process I got more specks of dirt under the screen :'(