The ChromaPop is nothing new.
It was originally coined to highlight Smith's color enhancing technology. Costa and MJ also do this, though I am not aware of anyone outside of those 3 doing the same. They each do it a little differently, of course, because there are patent rights to avoid! But the end effect is the same. Costa's "580" and MJ's "PolarizedPlus2" denotes the same. Since MJ's naming is the least descriptive, they also throw in the marketing mumbo jumbo about rare earth elements and making colors brighter and all that fun stuff.
Basically what it does is completely block specific wavelengths of light. Costa's "580" denotes 580 nm, the wavelength of the light it fully blocks (which is near yellow), for instance. In nature, light is a continuous spectrum. But our eyes only see 3 specific colors, the primary colors of light red, green, and blue. Colors that aren't quite those primary colors only partially fire the cones in our eyes and end up confusing the brain, as it says, "ok, green rod, you're firing weakly, do you see a little bit of true green, or do you see a lot of something that isn't quite green?"
What these glasses aim to do is block those in between colors, and leave us with just the red, green, and blue. Then our brains can recombine their intensity and interpret the in between colors. The result is that reds look redder, greens look greener, and blues look bluer, and everything in between looks better too because it's our brain making the color instead of being incumbered by our imperfect eyes.
TV's do the same thing. Red, green, and blue pixels, nothing in between. They can make colors brighter that way. Your dog, though, would interpret the colors on that TV screen very differently than we do!!!!
The weird thing is that the effect is not replicated in photographs, because film and or digital is not limited by three types of rods in it's eyes. It has no problem interpreting the entire spectrum. Millions of people have wanted photographic filters replicating what these sunglasses do, but it just won't work.
One issue I have with Smith's Chromapop is that as far as I know, they don't offer that particular technology in glass. Only their high end plastic. Both MJ and Costa offer this in glass too. That said, I think the whole "color enhancing" thing is cool but ultimately of low importance for a fisherman. Clarity, contrast, and good polarization are what's required for a fishermen. And all 3 of these brands offer that with glass being the cream of the crop for all 3, whether or not it has any color enhancing stuff going on.
"It's not glass, it's not polycarbonate". Well, kinda like Costa's 400P and 580P (P for plastic, not polycarb, cause it's not polycarb). MJ's Maui Evolution, MauiPure, and now MauiBrilliant (3 varieties of high end plastic, yay for marketing). Kaenon's SR-91. Everybody's Trivex. Even Oakley tries to join the game with Plutonite (though Plutonite, unlike the others, is AWFULLY close to being standard polycarbonate).
And hey, Smith DOES make polycarb too. They call it Carbonic. Without the coatings they call it "Suncloud" brand. So does MJ. They call it polycarbonate (marketers took a break I guess). And so does Costa. Branded "Native Eyewear".
As for polarizers, Smith polarizes like anyone else. It's true that cheapies laminate the film on the outside, which can peel off. Because they're buying pre-made, unlaminated stamped polycarb lenses.
But in glass, all decent brands if the lens is glass they sandwich the polarizing film on the inside between 2 glass lenses, not on the outside. And if the lens is plastic it's injection molded. So the film sits in a mold and they put liquid plastic in there, and it solidifies with the polarizing film inside.
Glass still beats plastic in terms of optics. In terms of clarity and chromatic aberration, the high end plastics do come close to glass. Close, they don't meet, though many human beings are unable to tell the difference, and some aren't. Depends on your vision. But plastics are polymers and not crystals. Anisotropic. Clear in one direction, not in another. And they flex. Flexing does two things. First, it destroys clarity. Second, it changes the polarization angle of incoming light before it hits the polarizer. So light that should be blocked, doesn't get blocked. Because of this a sturdy frame that prevents flex is more important in plastic than it is in glass (though more common in glass for protection reasons, and most plastic frames are shooting for lightness over optics and thus are less sturdy).