Hopefully...
it should be pretty darned good, linux on a mobile - and engineered mostly by google. My only concern is the recent quality of some of their applications... the main one I'm thinking of is Chrome.... if the phone is as flakey and resource heavy as that device, then maybe the Symbian guys are right, and linux (albeit this version of linux) isn't quite ready as a mobile phone platform. God I hope they are wrong though...
It would be pretty darned sweet to have a decent looking mobile (not the G1 attempt obviously) that I could develop for without being crushed by Apple (AppStore NDA hell) or Symbian (only allowing 1 year max for signed application certificates is disgusting, and causes massive confusion to end users).