I certainly would like to check into this. Co-location is nothing new, but I'd like to see what the agreements are for use of various networks. Yes, they are linked to Sprint, but if you have Sprint, I believe you are also able to get other network's towers...like Verizon's, even if it counts toward 'roaming'.
But it is always a good thing to know all options when one is searching for a new plan. I lost my sweatheart deal with an inside Sprint connection, so I'm like the rest of you...likely going to deal with 5gb limits. If I get a new service I'll be year round, because I actually did more streaming locally, for many different events, and in the past, used a lot in my career (architecture) while on site...very handy business tool.