The price wasn't much different than the neoprene or rubber, and I don't see how these could ever deteriorate or just wear out.
I know lots of folks are using these to get rid of excess motion with taller bars, but I'm running 8" rise z-bars. Or it might be 9".
Anyways. They're very solid now. I replaced some worn out rubber bushings with these and it just has a better feel. Solid.
I would repeat if necessary.