Your report matches my impression of their coverage. I head out of the city just often enough to go with a carrier that has better coverage. I've thought about getting some cheap plan on a better carrier for those occasions, but it's not quite worth the trouble. They're so close!
Worth noting - as part of the fall out with the AT&T deal - they got a ton of bandwidth from AT&T and they're putting it to good use across their spectrum. Not quite on par with AT&T/Verizon - but getting there!
