My favorite is the" take a look" on my sunglasses. Riding on the road it is a safety must for me. I like the bigger sized mirror in this brand. Pluses are less vibration, real glass, and very adjustable. I only use sunglasses for riding so I don't have to take mirror off and on. Only down side is the rubber tips fall off, but it is not a big problem, just be mindful when moving or mounting.
It does take a while for your brain to adjust to the mirror close to your eye, but it will, just be patient.
After being on the bike several days in a row, I keep looking up to see what is in back of me!