like pretty much every french bike part, quality is hit or miss on these. i had one that was okay, but my latest one was junk. the decomp threads strip out easily, esp if you are running the matching plug–air leak city. avoid.
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BAD DESIGN - PISTON DESTROYER HEAD
March 15, 2011
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Tomahawk from LA
The little hole in the combustion chamber doesn't make that head a true high comp head. The hole creates an air bubble and heat builds up. I blew 2 new pistons head because of that. I don't know what Malossi was thinking. Either you create a real comp head or you create a proper large hole for the decompression valve like on the polini 70cc head. That malossi head shouldn't even be on the market anymore.
butts 
BAD DESIGN - PISTON DESTROYER HEAD