I have various sunglasses for cycling, but TriEye has retired all of them for cycling. The fact that with a glance I can see what is coming up behind me gives me more confidence to share the road with cars. I like the fact I don't have to periodically turn around and briefly lose what is in front of me or steer off my line is fantastic. This product contributes to safety in a big way. I can now prepare myself for a car or truck coming up behind me and hug the shoulder more, no more surprises even from idiots who want to try and startle you or even a dog with its face out the window. Love it, I most likely will purchase another one.
I have always looked for sunglass mirror for while riding a bike, but never anticipated that a pair of sunglasses with the mirror built into the sunglass would be available. I used the TriEye for the first time yesterday, and absolutely love them. It is very convenient, highly adjustable, and easy to use this option for a mirror.
I am used to wearing mirrors attached to sunglasses. I prefer the TriEye. It took some time to get it adjusted right. With the attached mirror your line of site is blocked - not so with TriEye. However, you do have to move your head more with TriEye. Overall, I will go with TriEye. Better line of site; less likely to break compared to the sunglasses mounted ( 2-3 sets per year) and once tuned, rear vision is just as good.