Like Guy, I have one on my -8 and have never flown my airplane, or another -8, with a different prop. But it is a great performing prop, smooth, the airplane climbs like a bat out of ****, and seems to have great cruise speed as well. I like it... My only worry is if, while working on the airplane, I drop a tool on it and damage the composite blade. Other than than, it is great. Rain has no effect on it, other than damaging the Whirlwind decals on each blade. Greg sent me a new and improved decal but I have not had time to stick it on yet.