I've had this guy for a week, and i'm loving it. I've been on Virgin with the POS Intercept since October, and can say that in the NYC area coverage is excellent. However, the Triumph's antenna seems weak. It routinely reports signal strenth 10-15db lower than the Intercept. I haven't noticed any spots where I don't get service however, and I haven't talked on it enough to form an opinion about it that way.
The phone itself is amazing, though. it's as thin as my roommate's iPhone 4, and feels just as responsive, but it has a bigger (GorillaGlass!) screen. Battery life is mediocre, however. I unplugged it at 100% at 7:30 this morning, and now at 3pm (7.5hrs later) i'm at 64% I only checked my email a couple times and spent 15 minutes playing a casual game, but service in my office is relatively middling, so I think it has to put more power into the antenna.