Just finished a week with Smith photochromic red mirror lenses. I was highly impressed. These are in addition to my sun red mirror and storm yellow flash lenses. The photochromic lenses quickly became my everyday lens. They handled bright days and low light just fine (although on a truly bright or dark day, I’d switch out to a specialized lens). What impressed me the most was the ability to handle multiple conditions – particularly later in the day when the sun started to go down and some of the runs became darker. On one run in particular, I went from bright sun to almost complete shade. As I started in the shade, I couldn’t see any contrast in the snow so I stopped on the side of the run and after about 30 seconds, the lenses adjusted and were nearly perfect. The adjustment isn’t instantaneous, but fast enough. They are not cheap, but I certainly recommend them if you’re able to add an additional lens to your collection.