The main feature of this pedal is the "Dyno my piano" eigthies sound.
Dyno my piano had to do something with pumping up the sound with all kinds of tricks : overtones, EQ, tremolo, Tri-chorus, ... wich gave the unique Dyno my piano sound everybody loved in those days.
That sound is captured by Keeley in this pedal and the modes on it.
The tri - chorus sound is top ! It's a unique chorus sound. I suppose he captured the original Dyno My Piano tri-Chorus sound well, but I can't compare.
The waveform knob here is subtle.
The Rotary mode is good and has a unique touch because it is also filled with this "dynopiano sound". The rotary is certainly clear enough, other (more expensive) rotary's are maybe more defined. But the "dynopiano sound" gives it a nice and unique rotary sound others don't have. The rate goes fast but not as fast as other pedals. The mic-distance knob is subtle.
The flanger is also interesting, again because of this "dynopianosound". It does more the rotating-flanger than the airplane-passing-by-flanger.
So, it is a really nice pedal. But in the first place you buy that special sound to add to your pedal-chain. Only in the second place you buy a chorus or rotary pedal with a flanger-bonus.
