I have had many polarizers over the years. I have used filters such as this for over 25 years. I like the Tiffen as it is not too dark for most uses. I keep it on for almost every shot (unless it is night time or quite dark) to protect my lenses and for it's mild polarizing effect. (I take 1000s of images on a shoot, mostly landscape) Some other brands are too dark to do this. The dark ones many times look too polarized, and post processing has to take much of this out anyway. I do have a few of these and use them occasionally. I have found that an image that is properly balanced that does not need too much darkening or lightening post processing is much better, I have a Hoya but it is always falling apart (and way too dark). I have Heliopan 77mm Circular Polarizer Lens Filters and like the quality, but again they are too dark to keep on all the time. The Heliopan is the one I keep for special uses when I want more polarizing effects than I get with the Tiffen. The Tiffen polarizers I have had only were replaced when they became too scratched for use, broken from being dropped or run into things, or lost over board in my boat. As I said a couple of Hoya ones were replaced because they fell apart.
I use a Canon 5D with all high end L series lenses (most costing well over $1000.00) and have sold over 1300 framed GiClees ($300-$800 each). I feel that this filter does not compromise the quality of my images.
So in review. I don't want an unnatural appearance due to my filters. I do want the pleasing effects I can achieve with the Tiffen filter. I have never had a problem with any I had purchased, so recommend them to others. And I will continue to use them myself.
Albert Mach Fine Art