Everybody bags on Integy's parts when in reality they are made the same way as ALMOST every other aluminum part from most other manufacturers .
The problem isn't the parts its the people who put them on and expect them to be stronger than the plastic parts they are replacing .
Parts like a arms , bumpers , that take impact energy need to be able to absorb it and disperse it , Aluminum just transfers the impact energy to the next weakest part . Parts like bulkheads , hinge pin holders , knuckles , rear hubs , etc. can benefit from aluminum cause they don't experience the same loads on them .
Aluminum can be good if used in the right spots (even Integy parts) just don't expect it to take big hits and not bend or cause other parts to break .