Lightweight, full eye protection and it tints fast. The key is to find the right placement that doesn't slip. Once you find your spot, it's the bee's knees. Just a slight turn of the head is all you need. Also, I ordered the larger mirror with my order so I could compare immediately without having to order separately. Glad I did. I prefer the larger field of view and It's a great compliment to back-facing radar.
The easy view behind me is very useful for hiking, walking my dog and bicycling. Particulary with ebikes adding danger to the bike paths and rarely wanring that they are about to pass at high speed, my glasses warn me when they are coming.
Second pair for me. I use these for late in the day rides when I will finish at twilight. They work perfect.
Fitting in the prescription insert requires a little fiddly skill. A small screwdriver, a fixer's mindset to assemble a two-piece puzzle. My optician, new to TriEye, became my superhero; I thought I would merely pick up the prescription insert (–8 diopter lenses fit BTW), & do it myself. But she loved the concept so much, she put it all together! Now I have prescription bicycle glasses that I want to use in many outdoor contexts.