I don't like photochromic lenses. I have had several pairs of Smiths with them, and they are usually too light for bright conditions, and too dark for low light conditions. I prefer sunglasses with changeable lenses if I'm worried about changing light conditions.

I didn't know there was people who still bought unpolarized lenses these days! Smiths are polarized and photochromic, I don't know about anyone else though.