So to answer your question I think the G&P and Guarder shells are the best out there right now. I have seen fitting issues with the Guarder shell, the piston guides on mine were improperly casted and needed to be filed, and one I worked on had too much clearance between the two piston guides. In both cases the shells were modified and haven't had any problems. And I've noticed the G&P gearboxes require more shimming than usual for the gears, but that's not necessarily a bad thing, it gives you more room to move your gears around so as to make sure nothing is rubbing anywhere its not supposed to be.
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