It seems to work fine going through presets and designing sounds, but sometimes when a sequencer is triggering it it will freeze up and make no sound. You have to turn it off and back on to reset it. Also if you look really close theres a slight dent on the upper left of the unit. I never dropped it so this must have happened when it was shipped to me, but I never noticed it until months later. So beware that this is not functioning perfectly and you might have to fix it. Thats why the price is so low.