I have Perez, Ray Ban, and generics. The Costa Del Mar Fantails are great on the boat. Fit is wonderful, I bot the strap to go with it, as I am not taking any chances with the glasses being lost at sea. Arms are wide which is a +/-. Plus because it cuts down on glare coming in from the sides, minus because when I am on my bicycle, I like having more peripheral vision. All in all very happy with my purchase. I can feel my eyes instantly relax when I put them on.
One..these help reduce crazy night time glare.Two..They help if you are sensitive to other peoples bright lights driving, which cause you headaches.Three..You either think you look like a cool government agent.or a nerd, depending on your self confidence :).Love them, will buy more. Only downside is the lenses pop out too easily.