Wet Bolts vs Never Fail Bushing

[Bob Landry]

Some recent threads on here have sparked my interest in this and has prompted even more Internet research. I ran across never Fail Bushings, I think made by Lippert, and was wondering if anyone had any comments on these. The Bushings seem to be made of some space age polymer or some type of material that nevers needs lubrication, as opposed to the wet bolts that have to be greased. Any comments are appreciated.