the sprintech mirrors came in Friday... I did not feel like messing with them so I did not mount them for yesterdays ride, but mounted them on two of my bikes yesterday afternoon. I put tape on the mirror ball for one installation and mounted the other just like the instructions say.
This morning went for my ride on the domane with the sprintech mirror with out the tape. I rode on rough pavement with pot holes, I rode over some rough dirt trails and on some smooth cement bike trails....no movement of the mirror, it stayed right in place...no noticeable vibration issues and I could see traffic coming up on me just fine..
I got the sets, so I have mirrors on both sides, but I only looked in the right side mirror a couple of times (I kept forgetting it was there, not used to having one on that side). The mirrors are much easier to see with out much in the way of head movement than I had expected. I left the Blackburn mirror on for the ride to get a comparison and even though the Blackburn was larger, I found the sprintech to be just as effective and in fact easier to see, at the end of the ride, I removed the Blackburn. I liked them well enough that I am going to go ahead and mount the third set on the wife's road bike.
as a side note, the bike looks much better with these mirrors on it than it did with the Blackburn mirror sticking out from the handlebar.