Is anyone out there using a Prince or Catto prop on their Kitfox?

I've been watching, with great interest, threads on several boards about the Zipper motor mods and the associated use of these high tech fixed pitch props.

I have an IVO UL for my Mangy Fox project and if I use the Zipper kit, this prop is not an option any more as it can't handle more than the stock 80 hp.