The great advantage of these glasses is that the mirrors are protected from being displaced by wind or accidental bumping. The trade off is that you have to turn your head a small angle to get the same view as with the outside mirror. The way that I have them initially set, I need to turn my head to the left the same as if I were going to look directly at the brake hoods. It is not hard to adjust to that amount of turn. It might be an ongoing debate about which one prefers, but I am certain at this point that I will be opting for these over the outside mirrors. I bought these for rowing, but haven't been out on the water yet this year, and have only used them for cycling. I think they will be rated even higher for rowing since I used to use the outside bicycling mirror on the left for rowing. This double sided mirror will be great for rowing!