I'm a little compulsive on sunglasses (2 pair winks and 1 zooni), actually Zeal had a trade in deal last summer, if you sent in a pair of used Smith's, Bolle's etc. you got a pair of Zeal's half price. So I have a pair of Wink's with rose polarized lenses and a pair of grey polarized. I use the rose on partly cloudy to sunny days days and the grey ones on really sunny days. The Zooni's are smaller and don't cover my eyes as well as the Winks and I don't think they fit with my helmet as well. I wear contacts so I need the added protection. Yesterday it was windy and buggy when I was riding and I got nothing in my eyes.
My original pair of winks had interchangeable lenses but I prefer the polarized lenses. You don't have to adjust to shadows when your riding and you can see better in the shade.
A friend tried my on and liked them so well she immediately ordered a pair.
I had the Smith sliders but the Winks fit so much better.