I would have to agree with that, have a 120SC that has 100+ flights on it using a 18x6 carbon fiber prop. This lets the engine turn up about 9,300 to 9,400 on Wildcat 30/18 Fuel. The only problem this engine has had was a broken valve tappit, which was fixed using a metric anlan head screw. Very surprised to see that that screw has lasted for 40+ runs.