The NDX8 as Hoya usual very good quality with an impeccable easy aufzuschraubendem thread. Sits firmly enough and can be easily released again.
Supplied in a sturdy plastic case, but of course in this price range.
The filter is very easy to clean.
In the image quality I've seen no deterioration. The situation is different when you combine two filters together.
Here are (but only in the 100% view) slight loss of quality recognized.
Conclusion: A very good product that I not hesitate to recommend - 5 stars!