As far as the quality of the filter itself is concerned I have not noticed any problems, aberrations, scratches or distortion. The filter screws on noisily but none the less well and the adjustment lens is nice and tight which should prevent any creeping during use. Shooting downwards at the water, westward at late afternoon, gave me the opportunity to see how it handled glare and reflection. Although the pictures came out as boring as I expected, the reduction in both was marked and the effect variable with the rotation of the adjustment lens. The only complaint I had was a niggling one regarding the quality of the packaging. I am used to first run (new) filters being packaged in protective film inside a hard case and then inside a cardboard box. That is true for other new 77mm filters I have purchased, including those from K&F. However, this filter came just loose in the case, without any protective film as cover. Luckily it seems to have done no damage to the filter. All iin all this is a quality circular polarizing filter at a competitive price. It is well machined, fits perfectly and has a movement that is just tight enough to solve creepage. While I might have deducted 1/2 of a star due to the packaging, there is no mechanism to do that so my rating is a soft 5 stars; if you're in the market for a circular polarizing filter this one should definitely be on your list for consideration.