... anyone got one and what do you think of it ?

Depends what you're using it for. I like mine and haven't found the limitations particularly bothersome since I mostly use it to surf the web and some basic word processing.

Same as you , what model have you got ?

There are a few threads about chromebooks on here already, here's one:
http://forums.digitalspy.co.uk/showthread.php?t=1803824