Of the 4 REFACE units I am aware of, the CP initially seemed like the least exciting to me; as I have a lot of experience with classic 1 to 3 oscillator ADSR analog synthesizers as well as the famous DX7

(USB / MIDI / line outs / headphones out / etc)- Cool analog style

Incredible smooth analog sound (despite being digital under the hood)CONS- Retail price isn't cheap; for the same money, you can get a much more powerful device (but that is like saying you shouldn't buy a motorcycle unless you have a car; apples and oranges