Good build quality, but I would prefer to have smoother and easier turning. It is a little stiff. For the money the build quality is good. Image quality is good, just make sure to use the filter in the intended range shown on the markings. Heavy vignetting begins to appear on the last dot (darkest setting) and beyond that you can see the infamous X-pattern. Going to the lighter end, I see no vignetting at all. I use this between the brightest dot, and second-darkest dot. There is a yellowish colour cast that is present in the entire frame, thankfully no colour splotches that are difficult to fix. There is no colour shift when you move the ring. My biggest inconvenience is just that the filter thread on the front of the filter is slightly larger than my lens' filter thread, which means I can't put my lens cap on the filter. On my fuji XF16-80mm, the lens hood will not fit when the filter is on.Overall it does the job pretty well in most situations (overcast, indoors, golden hour, etc) , except in direct sunlight (at noon) you will have to stop down your aperture to maintain a 1/48th shutter speed. Some inconveniences but many of them can be worked around. You get what you pay for at this price.