ORIGINAL: magnat
TB-02s have been known to have weak Diffs or weak screw in their diffs
Stick with the TT-01, it has covered Bevel and Spur Gears so less risk of pebble damage
I have a TB-02 and I haven't had any problems with diff screws or torque-steer. I reckon they're great!
Also, the pinion and spur gears are covered. I've never had a pebble get in them, and I drive it on a very pebbly road.