Ill be keeping an eye out for how tmo does with the upgrades. They are prob the most reliable network ive had in the us, just not the biggest. The places they cover, the phone worked and it worked well.
They will probably have only 100 markets covered by the end of the first year. Thats just a guess though, They are launching multi mode base stations that can do GSM HSPA+ and LTE release 10 or older so basically they can launch it at the rate the new base stations are deployed in a given city.