Well-built, nicely designed 3-in-1 filter that combines different filters into one unit. The 1/4 mist filter is a bit on the softer side so you'll notice more effect when shooting white or brightly lit subjects. Can work at night to soften up bright lights. The effect is subtle.

However, where this multi-filter shines is the variable ND and circular polarizer filters. Having both filter effects on the same filter is surely convenient. The knob that sticks out is used for the variable ND portion of the filter which can go from 1-5 stops, pretty much all i'd need in most situations. There is no funny X pattern that occurs when using it either. Which is pretty amazing as you'd think that using it with the circular polarizer portion of the filter that artifacts would occur but nope. Many kudos for that. You can loosen the little knob and make your exposure adjustment then tighten it back up to lock it in.

The circular polarizer is towards the camera end of the filter and can be rotated around like a regular polarizer filter. Helps to have your ND knob tightened so you don't adjust the ND filter by accident.

The filter will change the color temperature on your images for sure. It tends to warm things up a bit and you may need to do some extra post image work afterwards.

Glass is high quality. Lens metal is high quality as well. The case for mine (55mm version) seems rather large for the filter. It would have been nice to have some sort of padding or foam to keep it from bouncing around. I'll have to fashion something myself...

Comes with 3 microfiber cleaning cloths as a bonus but no instructions for the filter other than essentially a K&F business card.