I agree with the positives! Great engines!
I've got one that is about four years old that has been run lean, slammed into the ground @ about 45 mph, busted case @ carb mount, has either worn out rear bearings or connecting rod/crank pin sleeve, and still can knife edge loop my Advance 40! Now that is an engine!
(The connecting rod is chewing its own trough in the case.)
I have two others in planes and one still in the box.

Jeff