Anyone use a Hartzell, metal prop on the rotary?

I would be very interested in talking or e-mail with anyone out there on the list that is using or has experience with a constant speed, hydraulic, metal Hartzell prop.   I'm looking at a prop for my pusher (Velocity) using a 20B and Tracy's RD-1 PSRU.   Looking for potential problems using metal prop and hooking up hydraulic governor, etc.

Fred Vandeman
VelocityXL   fvandeman@comcast.net