I have the 3 blade on my O-320 powered RV-4. I think if you've already got experience with the 2 blade equivalent, there's not much to know. A little bit smaller diameter, perhaps a little bit smoother.
But all the stuff that makes it different compared to a metal FP or whatever (lighter, the pitch adjustment system etc), you've already got experience with.
I replaced my wood 2 blade with it and love it. My only complaint is that because of the design of the central hub, I don't have the option of adding a weighted crush plate on the front (I already have the ring weight on the flywheel). I really wish I could hang a few more pounds out there.