I quite liked the CS-01 and actually bought the last new stock Yamaha had many years ago. Many saw it as a toy until they heard it piped through my recording console and FX. It didn't have many sound colors or flavors to choose from but it was very nice. Unfortunately a synth collector offered me an insane amount of cash for my new in box CS-01's and I couldn't resist selling them. Today they still seem to fetch a good price but are more of a novelty than a mainstay. Too bad the CS-01 didn't sound like a CS-80 in such a diminutive instrument. Now that would have been one hell of a synthesizer!