Would have to agree with George on the CL12-ET internals. Quality and materials are better. I will say this, with any motor it's a roll of the dice. I'm not sure quality control is a priority with any of the engine muanufacturers. I have 2 Sirio Evo 4 STI's and the engine numbers are only about 30 digits apart so they came off the line at about the same time. I took both apart before firing them up and the 1st onehad some metal burrs from the milling on the button and/or cooling head. It would have been a disaster had I not checked it. Incidently it's a much faster motor than my 2nd STI and they were broken in the same. My CL12 ET has a much tighter pinch after the same break in than do the Sirios and it still locks up from time to time on the starter box so it does surprise me that some are experiencing a loss of the pinch so early on with this engine. Just my .02 cents.

Regards,
Speyederjedi