I've been running Double Take mirrors on my KTM 690 Enduro for about 1.5yrs, and they were okay. They were obviously tough, but after a while the mounts started to wear, they would move on their own when I went over washboard roads and it began to be a pain. And I had them CRANKED down. Not only that, but the thumper vibrations made them hard to use.
The KTM Enduro mirrors are really a set and forget item. Much less vibration, lots of lock nuts to lock things down, and they still take a hit well if the bike gets laid down. Would buy again.