Dust will jam the buttons, it had once stopped halfway through a main with a thermal error, but it was nowhere near as hot as it is after 10 minutes, internal temp check doesn't work on mine, otherwise it works so far. Programming is very limited (or simplified, if you like it that way), number of cells for lipo cutoff (2-6), brake on/off, reverse on/off, motor direction, power profile(1-5), drag brake level(off, 1-5).