I upgraded mainly for the new tx500 remote. It uses some different tech that allows it to work at long distances without line of sight, where the spitfire remote sucked. one time it may work a 25 yards and the next time not work at 10 yards. It was to inconsistent. But dont get me wrong I killed a lot of dogs with it, just wanted something more reliable and also wanted the foxbang feature and the other features it has like the presets and such.