Bob,
I have not seen any excessive wear with the lube. From what I have noticed the friction from using them dry has worn them a bit.
When I was 16 I built my first Dodge, a '75 ramcharger with poly bushings and first installed them dry. In about 6 months of squeaky wheeling I took it apart and noticed wear. I assembled it with new bushings with antiseize and drove it for the next 5 years without a prob. In fact I think that the lube seals up the bushing and prevents dirt from entering. The Energy Susp. lube is a thick clear lube and is very hard to wash off. It will normally leave a small bead around the bushing after tightening. I just left the bead for protection. When I built the ramcharger I did not know about the Energy lube. I will continue to use the lube because of the good results and long life that I have seen. My '91 ctd has poly in the front Skyjacker spring bushings. The truck had these springs under it for years. I bought the truck from the original owner he did not say how long ago he installed the springs. The bushings are cracked at the ends and it currently makes no noise. But they are cracked and there are no signs of ever being lubed. I will change them when I get a chance and use lube.
Jeff