I don't think so. The main disadvantage with T-Mobile is their selection of phones is the worst of the main 4 carriers. But with so many new Android phones coming out often, the gap should narrow.
I couldn't agree more. I'm ready to retire my blackberry, but they seem slow to bring in the new stuff. I'd get a Nexus One if it weren't for the way they (or Google) are screwing family plan members charging more for the phone.