Warp Drive ground adjustable propellers

Does anyone have experience using a Warp Drive prop on an RV? They advertise a ground adjustable propeller and have suggested a 66"dia 4 blade for my RV-4 O-360A1A after I made contact. They have carbon fiber blades with nickel leading edge and a tapered blade for higher speeds. They also said a dampener is required for this engine that they can supply, but suggested using Van's f/g spinner. There was some trouble with hubs a few years ago but this may have been solved. Any information would be appreciated.
Phil Ayrton
Australia