From what I've seen, their coverage is widespread. I just got 5 8703 Blackberry's in at work from them since we are switching a lot of users over from their Sprint 7520's.
My boss and I were invited to an event put on by them the other night. We primarily went for the free EVDO cards they were giving out with 30 days service.

h:
They definitely are behind in pushing out RevA. I spoke with one of their engineers and he said it wouldn't be offered till possibly late '07, and into 2008. :down: