I was sprint prior to being Verizon. there were a lot of things I really liked about sprint. Their messaging system was horrid, but coverage was generally decent. Since my work phone was Verizon it worked well because one would have signal and the other wouldn't.
I basically switched to Google voice for my personal phone and run both on the same cell. The Galaxy SIII is so awesome. Wish I could talk work into hooking me up.