I'm sorry but I disagree..
I've had alum and plastic (RPM) and find that (first of all) all Integy parts SUCK DONKY DICK!! Yes's I’ve had the whole 9 yards (IE) top of the line stuff from them so before you start to right up the nasty gram I can speak from experience not out of my butthole..

RPM's are better

but you will find that they flex and you will pop out your pivot ball on hard crashes.
IMO I would go with RPM anytime and day of Integy..
Just my two cents…
P.S.
MY biggest waste in RC was to do this!..