I have a 3 pulley Cyclone on my commuter. It was a little noisy at the beginning (it was NOS) but it settled in fine. I'm running a 30/40/50 and a 13/21 so it's not really challenged by chainwrap or cog size. I used it just to try it. Works as a Suntour should, great.
I've seen ARX, Lepree and Cyclone models. The XC is new to me. Here's a lousy pic.
