I'm no pro but as a an experienced hobbyist, this is about a perfect sweet spot for me in value. I like having an ND filter as part of my kit but it's also not something I'm using super regularly so I'm not really willing to commit to one of the very expensive high end ones.

I would say that if you are only going to use it at lower density, you may want to consider just gettting a non-adjustable filter at the preferred strength. If you need the stronger filtering though or think you'd benefit from multiple different settings, this is a great value to be able to take the shots you want without needing to spend hundreds on multiple different ND filters.

I have a variety of filters and I guess I'd put this as comparable to the nicer hoya filters in quality level but that's based on informal testing and just general quality of the machining, etc. It's not quite up to B+W quality levels but it's also not junk.

It's well machined and seems to not negatively affect the picture from informal testing, I have yet to do any formal test shots that I can definitively compare. The adjustment is very nice and seems to match the range as advertised. As mentioned in other reviews, there are no hard stops on the adjustment and it's doubtful that the markings line up exactly with the different levels, I think there's going to be a lot of guesswork involved if you're using it in a way that you need to know exactly what density it's set to.

I reccomend getting the largest size you potentially need to cover all your lenses and then finding some cheap step-down rings on amazon to adapt it to the needed size, that way you have more flexibility in your shooting without needing multiple sets of filters.