This is my third pair of Smith's now. I bought the Slider series over ten years ago then upgraded to the Interlock when they came out. Now I just made the move for a set of Polarchromics. I have not had a chance to use these in many diverse conditions yet so I can't give a detailed review yet. But what I can tell so far is that these are by far the best shade I have had. The Techlite glass lens is far and away more clear than any plastic based lens on the market. The ultimate test for me will be when I'm on the river fishing until dark. If these shades can still be effective in the late evening then they'll forever be shade quiver. As far as construction and detail are concerned, these are probably the prettiest/cleanest pair of shades I've ever owned. Then again, for $179.00...they should be.