I just did some extended keyboard mashing, and the only bug I could get to occur was the one where the arrow keys stop working. This happened after smashing caps-lock, shift, letter keys, arrow keys, and keypad keys, all at the same time for several seconds. This bug happened three times, and each time, I was able to restore arrow key function only after pressing and releasing caps lock.

Frankly, it seems pretty robust. I'm not sure why I ran into more bugs yesterday than I did today, but for normal typing instead of crazy keyboard mashing, I don't think anyone would run into any problems.