Sprint has one of the worst coverage areas here in Dallas too.
I hope they keep moving forward though. It is my understanding things have not been so great for them in the days since buying nextel.
As far as I know, and not just based on their commercials, they really were the first carrier to offer the unlimited for $99 plan that many carriers since jumped on and/or improved upon.
Also, they are one of the first who are doing the whole "configure all your stuff and show you how it works in the store" bit. Apple has done it a lot with their stuff in their stores, best buy does it...I'm not sure of many others right now though.
I'm not personally a customer of theirs...but I do hope these kind of things keep up and Sprint can stay around as another competitor.