I have 2 hours on the Max AAC version with 1 rod change. The motor seems to hold up so far. There are signs of wear on the outside of the liner from vibration rubbing on crank case.

They do rev harder and power range has shifted upward as well. Hince you have to tighten up clutch spring and gear it lower. Don't be alarm if there are no nib left... They are like that after runin...

I still think they are the motor to have at this stage... Then of course time will tell if they last.