My biggest gripes was how limited it was for the money it cost, how weak it sounded most of the time, the obnoxiously bad envelopes, all the button combinations involved, and how lame the MIDI sequencing it offers was. The box was high quality but the rest was pathetic. I hated it. But then I 'm into making fat tunes to be played on big soundsystems and this is geared towards lo-fi and chip tunes and lounge electronica, which I hate.
tl;dr : the hate was strong because of how much it cost me for a box that looked good but was otherwise useless to me.