I had both types in aluminium yes. The original RB5 plastic hangers weren't the strongest, then again not that weak compared to some other manufactures, so ali was a no brainer.
The latest parts (UM708C I believe) seem to be much more up to the game and thus I'd not specifically suggest replacing those with aluminium.
If your only going to go for one set in aluminium I would suggest getting the set you will use most often depending on your preferences and most visited tracks and keep the plastic vesions of the others to tune if needs be.
Whilst "not cheap" I'd not say the hangers are too expensive either, Kyosho quality is never going to come a Ansmann prices but I think that the hangers aren't too badly priced considering they are a once only purchase.
If you use the ali hangers you should change the hinge pin bushes for LAW32 delrin ones, the others will result in wear in you shiney new hangers very quickly.
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