UHMWPE = Ultra High Molecular Weight PolyEthylene
Neoprene is more than likely far far too soft for bushes - although the only neoprene I have dealt with is in Diving kit. (as an aside - neoprene is generally made by injecting nitrogen into rubber sheets)
To Flyerncle - I assume that it is only the SS tube that is meant to rotate inside the bush. Otherwise given (a lot) of time surely the outer wishbone bush tube would also wear??
I personally think, that in terms of wear, the mileage we do is probably inconsequential. A lot of rep-mobiles are doing 50k a year, how many roadsters are doing more than 10k??
Again, not trying to start a ruck, just furthering my learning
Sean