I got this as my first lens filter for a Canon Rebel T2i. I wanted to do nice long exposure landscapes and light painting. I learned that a 10 stop (aka ND1000) filter is a fun tool to have. I took these shots in the first half hour of owning the filter, they are unedited straight off the camera. Can't wait to play around with it more. The filter comes with a round case that fits one filter between 43mm and 82mm. The outside of the case is hard plastic and the inside has rubber pads. Compared to how much you can spend on just this one filter (100+ from other brands). There is a slight color cast as others have mentioned but its very tolerable and correctable. Threads onto the lens nicely and fits the lens cap on the front.
I think this is a bargain if you are just learning and experimenting (like me).

This is my first ND filter. I am an amateur photography and wanted to experiment with some long exposure photography. This filter was priced very reasonably and I thought it would be good to start of with this and see if I can justify the upgrade to a more premium filter in the future.
In terms of build, you get what you pay for; the filter is very light and the aluminum housing is a bit cheap feeling. Since it is a cheap aluminum filter, I threaded it on very lightly being careful not to cross thread but still hit some patches where it felt like the filter threads were rubbing into the lens thread a bit harder than I would like. I suspect the manufacturing tolerances on more premium filters will be better.
In terms of performance, I found that this is not a true 10-stop filter. In the included photo, the test exposure was 1/20 seconds at f16 and ISO100. Putting on the filter and keeping the aperture and ISO the same I got the correct exposure at 13s which is just 8-stops of ND. On the positive side though, I noticed a slight but largely non-destructive color cast in the image.
If you need to use a 10 stop ND frequently than maybe a more expensive proper ND1000 is justified. For casual use I think it's hard to complain given the price. If you do need a full 10-stops then in a pinch you can shoot 4 8-stop exposures and stack them.

You can spend a LOT of money on ND filters. I'm no pro, my photos make me happy but don't make me money, so I didn't want to spend $100+ if I didn't have to. But I'd heard a lot of stories about cheap filters having bad colour cast, or not affecting exposure accurately. So I figured I'd take a couple test shots with this one. And I'm very impressed.
The first photo was taken with my 5Div and 85mm f1.8 lens at 1/20s, f1.8, ISO 100. Untouched jpg SOC.
The second is the same camera and lens, now with the 10-stop ND filter, in about the same position (I picked it up to change settings and put on the ND filter): 3.2s, f1.8, ISO 1600.
To my amateur eye, there's no significant change in color or exposure... K&F says 10 stops and it really is.
For what these filters cost this is really really good.

This is a good product unfortunately for me I did not read the description properly. Mistakenly took it for granted that it was adjustable but it turned out to be 10 stops which is extremely dark. Other than that I found it to be a good product. I have used it in very bright sunlight which is what you should take into account if you buy this product. Would recommend it if 10 stops is what you require.

A high-quality filter.