I have had good results so far with picture quality. I went out this morning and took these shots. It was a bit bright so I will have to try again when it's darker but I like what I got. As far as material quality only time will tell.
02/07/2019
This is officially the first review I've ever written on Amazon, but I was so impressed with this filter, I just couldn't help it. I've owned numerous cheap and expensive ND filters over the years and this is, by far, the best I've found. I've used it on both a 50mm and 28mm lens on a FF camera and saw no color cast, minimal to no vignetting and excellent detail retention. At the price point it's a no brainer. Being able to go out midday and shoot long exposures is a total game changer!!
27/06/2019