Well, I see reviews where people complain about how expensive filters are, even ones in this price range. Aside from the fact that you couldn't get filters of this quality 10 years ago (really just because of advances in multi-layer technology), even filters that were close were very expensive, at least for me. The only advantage of the filters being in this high price range is that the mounts are made of brass (and K&F has their top line with even more multi-layer layers and brass rings, I haven't tried that yet). They are nicely milled and have deep knurling on the side, which is nice to use especially with a rotating filter. This particular filter spins very smoothly. I have the same Nano series filter in two other sizes, and the large one, 82mm, spins stiffly. I expect it will loosen up. This particular filter (67mm) is pretty smooth though. So what makes this 5 stars for me? The polarizing film included works as expected and there is very little color cast. While I haven't done a light transmission and reflectivity comparison test with their CPL filters, I have done a pretty extensive comparison with UV filters and the Nano series was in the top tier — again, competing with filters costing up to four times as much. So I'm extrapolating that the coatings on the polarizers are just as effective. To be fair, I should mention that the newest of my "expensive" filters are at least 5 or 6 years old and, as I said, there have been a lot of advances in coatings recently. The cap, cleaning cloth and filter holder are just bonuses. However, I would rather take the older, round K&F filter case than the larger box this one came in.