I had an XP-30 and an MS2000r. In my opinion, I thought the MS2000r was way better sounding, especially for synth bass stuff. Way easy to programm, and it has a really kickass vocoder, way better vocoder then the NOVA vocoder. The MS2000r is very affordable now too. But hey, there is alot of people hear who'll disagree with me. Try em out for yourself, tell us what you think!