Got my used unit in.
There are a few very small scratches on the back, hardly worth mentioning. Front touchscreen is flawless. The big thing is that one of the corner rings is broken clean off:
http://i3.minus.com/ibwIyO0AFuEZQN.jpg
Honestly I don't care about the ring itself; I didn't even notice it right away. I'm more worried that it broke off in a drop that might have damaged something inside.
I've only had one problem so far, and I also solved it. I plugged it in and let it charge for a bit before going through system setup, then I put it back down to charge for a few hours. When I came back I noticed that the touch screen didn't work when the system was plugged in, but worked fine when it was unplugged. After a little trial and error I figured out it was the garbage generic AC adapter that they sent with the system (box shown in the picture above- enjoy the engrish). I plugged the usb cable into another usb power adapter I have and it works fine. The junky one they sent must be interfering with the touchscreen somehow. Incorrect/unstable voltage to the system or something maybe. In any case, if anyone else is having that problem try a different adapter. I'm not sure why it worked fine the initial time I used it, but maybe it only affects the touchscreen when the battery is full / near full?
So far I'm happy with it. As I said I'm a little worried about what caused the ring to break off, but I haven't had any problems but the one that I already solved, so I'll just have to see how it holds up.