I just installed a pair on my bike, and after riding to work today, they are world's better than the stockers. They vibrate a hair less, although at lower engine revs they flop around in a slow vibration. The adjustment took me a bit more effort than stock, but isn't annoying. I'm going to go ahead and venture that they will hold up much better than stock for offroad expeditions as well. I also like the larger viewing area, even though I'm not big on the Mickey Mouse look.
My right side stock mirror took a small bump in Colorado and won't stay in one spot more than a city block now. They are a bit more than I would've liked to pay, but I don't regret buying them.