My buddy ordered the mirror extensions at the same time that I purchased my replacement mirrors and we put them on in the same driveway on the same day to travel together the following day. I loved mine and only spent $170 on Amazon to get them. Took about 1-1/2hr to install both. He wasn't so please with the slip-ons. Enough so that he ordered the replacement mirrors from Amazon as well when we returned and sold the slip-ons on Craigslist. His biggest gripe with the slip-ons was vibration while going down the road making it hard to see clearly in the mirrors.
Ode to the Forum Moderators
May the Mods grant me the serenity to accept the opinions of those I cannot change,
the courage to offer valid input to those who are open to another way of thinking,
and the wisdom to shut myself down whenever I get too in love with my own misconceived brilliance.