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I purchased a warp drive for my O-200 STOL 750, but I am not quite flying yet so I can't comment on performance. I built up a O-200 with 9:1 compression and plan to overclock it a bit. Warp Drive recommended the 68" with standard blades and 70" if I wanted tapered tips. They said the tapered tips would give a higher cruise speed. I went with the 68" three blade for my application because of the higher tip speeds I will have at my planned 2900rpm red line and the added ground clearance will be nice.
I have run warp drives on other (slow) aircraft before and love their durability, cost and smoothness.
The Warp Drive provided 10" fiberglass spinner is a great match to the STOL 750 cowling too.
Thanks for the info Jean-Paul