Congratulations on saving a nice chunk of change every month!
I chuckle whenever someone cracks some wise a$$ comments about T-Mobile. It's like they're afraid to be the only one left paying the outrageous Verizon charges. Verizon would like all to believe that they're the end all be all, and that strategy has obviously worked on many - I had to twist many arms to get my siblings to switch, believing that it'd be the end of the world if they dropped Verizon. They couldn't thank me often enough after they switched, saving them hundreds a month.
Yes, T-Mobile definitely has more spotty coverage than Verizon or ATT. Guess what, I'm not all that important that I require 100% coverage 100% of the time. And when there's good coverage which is everywhere I usually am, speeds and voice quality absolutely destroys Verizon and ATT.