Anyone have experience with the shaft collar retainer with bearing flat from vex, are they worth using or are they just a gimmick-y type of bearing flat that doesn’t really have too much use besides a few scenarios?

I have some from an Exp kit and they work well. It is kind of annoying if a rubber shaft collar wears out in it, but other than that it is good.

i would only be using metal shaft collars in it so that wouldn’t be an issue