That's actually the one part that's been great - well, aside from the price. I live in a pretty rural area. On Verizon you can't connect to 3G from my house, and can't even use voice unless you stand in front of a south-facing window. Tmobile gives a full 5 bars with very decent 3G speed. And it's not just around my house, the broad area is incredibly well covered.

I realize that's probably just local circumstances and I know Tmobile's network is a fair bit smaller, but I can't personally complain about that aspect.