The glasses were comfortable enough and provided decent protection from the glare of the sun as I experienced it while wearing them. The lenses are photochromic meaning that they lighten and darken depending on the lighting conditions. While some photochromic lenses take several minutes to change, the Rudy Project lenses that I tested made the change in about 30 seconds. The published material I found said that the lenses accomplished the change within a few seconds - and maybe they did. Maybe my eyes took longer to adapt. If I had to guess I'd say the change took no less than ten seconds and I didn't feel it had been completely accomplished for 20-30 seconds. Again, this is a subjective perception. Perhaps with lab equipment a test can be performed that shows different.
Priced at approximately $200 per pair, the sunglassea are obviously stylish and that's not an unreasonable price when you look around at other "brand name" sunglasses. With a history of use amongst noted atheletes and olympic competitors, the Rudy Project glasses have become well accepted. It will be interesting to see what else they produce in the future. I will keep you updated on anything new I test or learn.