First of all, they are absolutely beautiful glasses! In terms of quality (frame, I can't know about the lens), and appearance, they are worth every penny! Much better than sunglasses that cost 200€ that I have bought in the past. I wore them for as long as I did and they didn't tire me at all. Later on, I might change the lenses if I see that they tire me! Anyway, the design is perfect and I'm thinking of getting them in other colors too!