I picked up the new T-mobile G1 last night. I like it. It seems stable and functional. It doesn't have the style and elegance of the iphone but in terms of UI performance it is more responsive. Applications also seem more stable than the iPhone. It hasn't crashed yet (which is more than can be said for iPhone).

Other features I like are the REAL qwerty  keyboard, DRM-FREE music, gmail/google integration, and I do like the Android Interface. I also had a chance to fire up Eclipse and start tinkering with the API. So far the API seems robust.

It isn't without its issues. The G1 definitely feels like a beta, as do most google products. There aren't many applications available and as of today it has no video player. I would not recommend it for non-gadget nerds just yet.

My only other gripe is with the T-mobile network. Having had a Verizon phone for the last 8 years I've never had to worry about reception. My residence is in Boston so I have excellent 3g coverage. My office is in Waltham and coverage is "spotty". For the time being I'll keep a Verizon phone with a minimal service to remain accessable.

The final verdict: It is a nice, functional piece of hardware and Android shows lots of promise. It is lacking a certain level of polish and applications so it is still a Beta as far as I'm concerned.