Bought my first pair of Smith sunglasses back in 2000. I thought I'd never pay this much for a pair of shades. Took my chances and it paid off! Those Smith Sliders lasted six years. (I finally lost them or they would have lasted ten+} I was so impressed by the quality and durability I wouldn't even consider owning any other brand of sunglasses. I got online and found these Smith Threshold shades here at Backcountry.com cheaper than anywhere else. These are the model closest to the pair I lost. I got them within four days as promised. These shades are great, even better than before. Slightly lighter weight and a more balanced polarization compared to the previous model I owned. I couldn't be more satisfied!