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.