I use this unit for two months. I find it quite right for me, in fact, that it is powered by the USB is very useful on stage, the two trigger inputs are very useful (I have a trigger on my roland bass drum) . Once properly adjusted, there is no problem, contrary to what a user says, by setting it properly, the notes do not fire if we hit the right pad. The quality / price ratio is perfect. I do not really have to repproche to this unit.