I upgraded from th tb to rez for $50 last month. The rezound runs on sense 3.5,tb runs sense 2.1 assuming stock. They are similar in function other than that. The rezound is faster, but not by a huge amount. There is no perma root yet for the rezound, but there is a clean tool that can debloat and desense. The screen is sharper. There is no kick stand on the rezound, but you can get a case with a kick stand. The radio seems to be better on the rezound than the tb. Rezound has a longer but narrower screen.