We have a little over 100 of those Chromebooks, Acer C720s.  A word of advice, when you open the lid, open it from the middle of the screen.  If you open it from a corner, the plastic will flex and there's a decent chance of the LCD glass cracking.  I've seen it first hand, a student simply opened the screen, with an audible CRACK.  There goes the LCD.  We've had 4 of our Chromebooks break this way.  Fortunately it's covered by warranty.

Another problem is that super thin, uber tiny power connector.  We've had a couple of those break off both in the power port and in the microphone port... because they made the microphone and power port the exact same size.