So far I've placed about 500 miles on mine. All I can say "Good job Ned!". I owned the other mirror that's sold on this site and all I can say it's a night and day difference. A lot Less vibration on the mirror and I can actual see what's behind me now.
I haven't tested them in a drop yet, but I do believe wtih the way they are designed they will hold up just fine.
Anyone that's still on the fence in regards to buying one, just go for it you will not be disappointed !!