I left 10 years of AT&T for T-Mobile because of the N900. I had to wait a week for my contract to expire or they had a hefty fee for me, but somehow I survived on 2g. I had a 3g winmo phone before, and I was perfectly happy with AT&T. For some reason, I didn't have all of the issues that iPhone users seemed to have with AT&T, which leads me to believe that Verizon will suddenly have the same problems if the iPhone is allowed there.

T-Mobile gave me a very good deal--it is actually cheaper per month if you don't get a contract with a phone discount. I now have no contracts and own my own phone...it smells like freedom.

I still have my wireless usb gizmo with at&t...t-mobile doesn't really have a plan for that.

I think the 3g map for AT&T is a little better than T-Mobile here in Austin right now, but I always have at least 2g and T-mobile seems like they are growing.

Basically I have had no complaints so far. I say take the plunge.