In short: I like this case. My Nexus 10 is held very securely in the case. The edges of the case do come right up to the edge of the screen though, so pulling down the notification bars, or tapping any edge of the screen is a bit more trickey.
The Keyboard is a bit small, but definitely usable, and much nicer to use than the onscreen keyboard.
The keys at the very right edge of the keyboard (backspace, return, and especially delete in the very top/right corner) tend to get stuck in the down position by the 'leather' case that the keyboard is wrapped in.
I find the space bar is a little finicky - unless I'm paying attention, I tend to write sentences with no spaces between the words, because my space bar press didn't register.
The keyboard is very light, and it's awesome that it's removable. The magnets holding it in place are just right - strong enough that it will never fall out, but weak enough it's trivial to pull the keyboard off. Removing it will make the case a lot thinner, but not take away much weight.
The battery lasts a long time. I've left it turned on overnight, with no problem, and it seems to charge in just a few minutes.