Google Chrome OS

Pros: When they say 8hr battery they mean it.
Nice display quality.
Enterprise setting can be remotely controlled.
Total replacement warranty.
No virus worries.
Software seems pretty robust.

Cons: Touchy about wireless settings.
Enterprise setup has some undocumented pitfalls.
Get quite difficult if they don't have a constant good internet connection.

Summary: We purchased 46 of these for a school. The first time we turned them all on they stopped functioning. Turns out the first thing they each wanted to do was run a 700mb update. Downloaded fresh system on 2 usb sticks and did it manualy. Good news it it only takes 11mins per machine to update and configure to the network from out of the box. After 2 months 1 machine needed to be refreshed (11mins) and one machine had to be replaced. Not bad.
Chromebooks are very limited with what they do but if thats all you want them for then its no a problem. Although they require very little maintenance and are nealry impossible to stuff up which is a saving I still think they cost too much.