Prometheus? Seriously, it's not as much fun as i thought it would be. The "Step" mode (which gives the chopping effects via a rhythmic tempo) sound great but they're hard to dial in and if you're playing in a live band context to a fixed tempo / click track I think it'd be hard to pull off.
The normal envelope filter type sounds are alright - again, the sensitivity of each knob's setting changes the sound alot, and they all interact off each other, so a slight movement can change your sound altogether. It's a bit frustrating at times, and I gotta admit I still rotate this with my Emma Discumbobulator a fair bit, that's a lot easier to use / set and forget...plus the envelope filter sounds are better.
Still trying to find a killer use for the Prometheus' Step mode since that's really what it's meant for.