Greg, I've used the doubletake mirrors for a couple season on my thumpers and love them. Every now and then, someone mentions the mirrors can move at high speeds, but most don't have the issue. Some have wrapped a piece of tape around the mirror ball (which is hard poly and not rubber like the RAM balls) and they hold better. I've not had to do that but only ride up to 85mph on the bikes on which I have these installed so can't speak to high speed riding or how windshield buffeting might impact them. Vibration is no more than stock mirrors and they do fold inboard, or anywhere else you want. On my trail bikes, I never fold them in. If you loosen them just a bit, they will move if you drop or crash the bike, then crank them tight again before hitting the high speed tarmac. I use the aluminum RAM arms (don't use the poly arms) and the 3" arms rather than the 2" because they get the mirrors out further to easily see around ones arms and shoulders. Highly recommended. I'll be using them on my Super Tenere when it arrives. P.S. Sorry about that branch. I have a chin scar in the same spot from getting taken off my feet by a 2" thick nasty vine across the chin when on a full run through the woods back about 18 years ago. Took me right off my feet and knocked the wind out of me when I landed. And though the saying goes "chicks dig scars", to this day I've never had a young chicken look at me longingly.