it's all metal - and metal bends, and wears down over time (and abuse). and i DID manage to bend and gouge the crap out of some arms, which i replaced with UE while parts were still available. for me, it was all about replacement availability. if i have a part that needs replacing, and that
does happen with UE, i don't want to search the 4 corners of the earth for a replacement.
in the end i was offered $2,600 for just the roller from billy's trucks. that's about what i put into it, with a little profit. that's about the only time that can be done with r/c's, so UE has that going for it.