Used Sprint for 6 months and was not happy with the service at all.

Switched to T Mobile Jan 1. My wife and I are on an unlimited everything plan for $100 a month. The 4G data speeds are much better/consistent than Sprint 4G. Even the 3G service areas seem to provide better service than Sprint.

Like others have said, coverage in rural areas isn't so great. So plan on big dead spots during road trips.

FTR Our Jan (Feb seems to be on par as well) bandwidth usage was just under 100GB of data used. Have not experienced any throttling etc for the massive usage.

Another great feature is the included unlimited global data and texts. While the global speeds are significantly slower it is sufficient. So far I have used it in Switzerland, Australia and Canada (am writing this message on TMobile global data from Panorama, BC.)