I played with a, ummmm, let’s call it a “fully functioning demo version” last year. I didn’t have the controller with it so I was stuck using an M-Audio Oxygen 8.
It sounded really good compared to alot of VST synths and wasn’t as big a RAM eater as some of the Moog and Arp VSTs out there. Still, you need a pretty powerful machine to get it to sound good and run smooth.
A few months back either Keyboard or Electronic Musician had a few engineers run blind side-by-side comparrissons of the MS20 softsynth against a real MS20. The engineers couldn’t really tell which was which, and in a few instances thought the softsynth was better sounding than the real thing.
On a side note, the first synth I ever bought was a Roland SH09 that I got at a pawn shop for $50. They also had an MS20 for the same price, but since I knew nothing about synthsizers at the time and I couldn’t get it to make anything other than white noise I passed on it for the Roland.