I have been running this engine for over a year now and it has been a nearly flawless motor. Only time it didnt run right was my fault messing with the needles.
I run a Vess 22A on mine. A lot of people will swear by certian props. As far as top rpm... I could care less about that as I am more concerned with how the engine performs on transition. What really matters is... what does the plane like? I am flying a 27% Ultimate. Lots of drag so it need lots of pull (traction). So the lower pitch prop is perfect for this plane. I havent tried a 23A or 22B and I am sure this engine will pull either just fine. It has the power to take it staight up on demand at most any attitude without any lag even after extended low rpm run and thats important to most any seasoned pilot.

BTW from what I have experienced so far the Vess is one of he quieter props out there.

Cant really go wrong with this engine from a value point($390 shipped including accessories). And certianly no problems with the service from Bob Kramer (DLUSA.COM)who markets them localy here in Texas.

Wayne