As a certified optician, I thought I would weigh in. So, the Chromapop lens and the Costa 580 lens both try to reduce 'light confusion' by selectively reducing blue and yellow light transmission. I believe the technology used is different though. I like that the Chromapop does not use traditional polarized sandwich construction, avoiding adhesives. In the 580, Costa uses either polycarbonate or glass. The glass lenses are spectacular. The poly....well, it's poly. Polycarbonate is popular because it is tough and light, but it has the worst optical clarity of any material. For the Chromapop, Smith uses trivex. Trivex has very good optical clarity, about like CR-39, definitely much better than polycarbonate. It is also a bit stronger and lighter. I really do like the Costa 580G lens a LOT, and Smith's polarchromic copper glass is also spectacular, but where Chromapop truly differs is having very high optical clarity in an IMPACT-RESISTANT and LIGHTWEIGHT lens material.
I agree with previous posters who prefer a brown lens color to a copper lens color for fishing versatility, although the copper is nice in brighter conditions. Chromapop is now available in mirror! The bronze mirror is on a polarized brown base, kicking transmission a bit more toward blue, which feels a lot more 'true color' than either the Smith polarchromic copper or the Costa amber or green mirror. The Chromapop Ignitor, like Smith's regular Ignitor, is a specialty lens for low light.