Looks like you haven't used them in a while. I just drove cross country with a Verizon and T-Mobile phone....T-Mobile had excellent coverage. It will only get better when they roll out all of the 600mhz spectrum they purchased. In a few years their network will outpace Verizon's mythical network.
Switched to t-mobile from att after 10+ years of being an att customer and service actually seems a little better in the bay area.