I've got it, but I'm not really using it.
It's probably a good idea but it feels like too much change at first. I need some time to have a proper play and get used to it.
I agree, but I'm making myself use it. The only thing keeping me from using it full time is the missing notification for the tab. I need to know if I have mail for some reason... I should stop caring about email. As soon as they give us some labs and it includes a new mail indicator I'll probably switch over to it full time.
How is it different to Google Wave...?
...and it's currently supported by Google?
(until they get bored with it, that is)