I went with the SD elastomer perches and have been pleased with their performance. I have about 20K miles on them so far with no apparent wear. They are also have a grease zerk for yearly maint.Yes, that’s what I’m saying. Brand new and uninstalled, they moved as freely as my buddy’s roller bearing perches. That said, I don’t have any data on how well/poorly they last in the long term. I’ve had them a few years and probably +/- 2k miles. So far so good.