MikeElBike I have used Take-a-Look glasses-mount mirrors for 30 years. Actually only 2...they're brass and metal and that sturdy. No vibration. I've tried a plastic one and it broke. I also tried another brass and metal one from another company, but the shape was sub optimal.

With the Take-a-look glasses-mount mirror there is no shake. It is as natural to use as the inside rear-view mirror in the car. And by turning your head you can see behind you from curb-to-curb, a wider field than any convex mirror....all while keeping your eyes on the road ahead.

The take-a-look is also very sturdy. A few years ago on a windy fall afternoon a tree branch fell and hit my helmet and knocked the mirror off my glasses. I found the mirror the next day under the leaves by the curb. It had been run over, but I wiped the mirror part, put it back on and am still using it.

I had also put handle bar mirrors on my bikes, but have removed them all a couple of years ago because I never use them. They vibrate and the image is too small, especially when too convex.

I suppose a helmet mount mirror would have all these advantages, but I went with the glasses mount variety and "never looked back."