I've had a pair of these mirrors on my previous machine for 10 years. I've been so happy with them that one of my first purchases for my new Pro R was another set. They come packaged very well in a protective box lined with thick foam padding. I definitely like that you can order these tuned to the diameter of your roll bar, rather than having to add all kinds of spacers that tend not to stay tight. I've put thousands of miles on my previous machine on all kinds of terrain and have never had the mounting clamps move a single mm. The multiple axes of rotation and adjustment of these mirrors works well with all the odd angles of roll cage bars. Also, the low profile clamps are compatible with rigid windshield mounts. I've recommended them to many friends and family members.