I'll be interested in what folks have to say, too. I have a Nokia 3650 I'm looking to replace. It's been a nice system for years, but it's time to move on. The main thing I've missed on the 3650 is a keyboard. Actually coding on the system is prohibitively slow except for the shortest bug fixes or constant changes. T-Mobile's data service has been good and affordable for me, so at this point I'm not looking to change providers.
If the Nokia 810 had a phone I'd get one in a heartbeat.