One word... (Score 3, Insightful)

Backhaul You can have 7.2Mbps to the base station, but from all accounts, the backhaul from said base stations SUCKS, so you won't get anywhere near that. Thats the sneaky trick. They offer UP TO 7.2Mpbs, but really its dependant on backhaul, and how said backhaul has been configured. Expect throughput of about 500kbps