Had EP-133 KO II. Very frustrating. First time, I had an inspiration for a beat so I grabbed it and after an hour of learning curve I realized basically anything I wanted to do I couldn't. Limited time signatures didn't let me record the beat I wanted in the first place. Then it turned out only one fx can be used at a time (want delay and reverb? nope. want delay on the synth and reverb on the beat? nope again), you cannot actually save projects, cannot tune notes etc.

Even for using it just as a fancy overpriced MIDI input, velocities from pads were way too unpredictable compared to a cheap korg nanosomething.