I had one for a while, but it was not as great as I had hoped. The balance was not that good... it really wobbled, esp. at the higher speed. Also, there was a bit of an audible pop when switching between the two speeds. One top of that the thing was VERY heavy. I haven't tried any other rotating speakers, although the current Leslie models look nice.
One other thing I remember is that when I had called Mesa Boogie to get some support on the Revolver, they had none. Apparently the person who designed it has long since left the company, and they now have virtually no information on it.