I had a play with a poly evolver before I bought my andromeda a6. The keyboard was great and it has some awesome features, the sound though was not so impressive. Its hard to explain but It sounded a bit digital to me, not the usual analogish feel at all and the curtis filters just didnt do a thing for me. Much prefer moog/sem/cs80 filters.
Worth playing with one to see if you like it tho, it still spanks VA sound
tom