I have the Tifosi Slips (interchangeable lenses) and LOVE them! I tried seemingly endless kinds (brands and styles) of sunglasses and ended up with the slips. I was playing around with the pink Gavia's in the LBS just Monday while I was waiting for my bike to be fixed. They're cute!

The slips give fantastic coverage and block the wind well (I have contacts). I have to remind myself that I have them on - you don't see the frames or edges - it's wonderful! Changing the lenses is a breeze, too. The optical clarity is great. They stayed on when I crashed last week.

I also bought a casual pair (metal frame). Same lenses, just different shape. They hold up well. I dropped them on concrete - no scratches!

The best thing is they are great glasses and won't break the bank.

I highly recommend!