I think though that I have seen on some speedtest sites around 180 Kb/sec on ATT Edge. But that's about the best I've seen so far and in isolated places.

I was a Voicestream/Tmobile user for about 7 years and had 5000 anytime minutes for $39.95/month and was grandfathered in with that plan and left. Their Network was very seldom useful for me. I lived in a highly populated area and couldn't use the phone in my house or a ton of other places that ATT worked fine at. So I divested and never looked back. If Tmobile works good where you try to access it, then OK. But I traveled a lot and it was always dismal for the 7 years I was with them.

I knew when I bought the N900 that I would just have to put up with Edge. I'm glad I didn't switch for another reason though. I am so disappointed in the N900, I would be really pissed if I switched to Tmobile only to get pissed at the device. I don't think I need to go over what I am irritated with, there are a million threads that describe how I'm feeling. Nokia is a total let down yet AGAIN.

Ohh, and don't believe those TMobile coverage maps either... The coverage maps look like they don't cover much, and they don't cover near what they claim they do.

If you live in a very large city and don't have to travel a lot and use your phone between large cities it may work for you.