All sample photos were taken with the CPL filter on a 24-70mm lens.

First Photo - polarization. Brighter sky, less saturated blues.
Second Photo - with polorization, more saturated blues with higher contrast all around.
It's a subtle difference, and I'd argue with AI can be replicated with the right post editing software. But, I really don't want to be doing that with every photo I take.

3rd photo - it cuts through that water so effectively.

I'm very happy with the CPL. I use a ND1000 filter for most long exposures, so the other ND8 and ND64 are just bonuses to me. I can stack them super easily since they are magnetic.

I have zero regrets with this set.

K&F filter set works great for my needs.

I use several lenses that use 77mm filters and K&F (one of my trusted brands) has put together this kit of neutral density filters and a circular polarizing filter in a beautiful case. They even included a lens cap--and you know how easy those are to lose. The filters themselves are well made, solid threads, and with good optical glass and coatings. Highly recommended.

If you use the screw type ND filters for long exposure photography do yourself a favor and get these magnetic filters. The ease of being able to quickly remove the filter to meter, focus, and compose your shot then put the filter on and take your shot is well worth replacing your screw on filters. These filters are of very acceptable quality both build and image wise. The pouch is much nicer and of better quality than I expected at this price. I also like the magnetic lens cap for when you want to pickup and move your gear to a new spot. I bought this set since it includes the CPL then purchased a separate magnetic K&F ND1000 and that's pretty much covers the filters I use most. I'm really happy with these filters.

This filter set works well for hot swapping. The magnets are quite strong and hold the cap and filters nicely. The CPL turns smoothly, and even though it's magnetized works great. The ND filters require no turning and simply snap in place. You can even stack them! They all fit inside a well constructed case with a magnetic flap and weathersealed zippers

The only con I noticed, I was unable to thread on a non-magnetized filter to the magnetic mount. Therefor, you are locked into using this system unless you remove the magnetic base. It's just like how I used filters before so it's really no big deal. All in all, this is an uprade I will be using all of the time now.

The K&F Concept neutral density (ND) and circular polarizer (CPL) magnetic filter kit contains two ND filters, one for 8 stops, the other for 64 stops; a CPL filter; a threaded magnetic filter-holder ring, and a magnetic lens cover. The kit includes a padded bag to protect and hold the filters.

I ordered the kit with 82mm filters. The magnetic attachment is great for easily interchanging the filters. No need to unscrew a filter and then realign threads to reattach a different filter. You simply firmly tug on a filter to remove it, and then magnetically attach a different filter. Very simple and the filters are firmly held in place – no concerns about them accidentally detaching. The lens cover can be placed over any of the filters, so no need to remove a filter before putting the lens cover on. In addition, I was able to place the “pinch-style” cover that came with my lens on over the filters also, providing another option. Like the magnetic lens cover, the magnetic filters can stack on top of each other, but the filters are not threaded, so a threaded filter cannot be placed over the magnetic filters. The magnetic base allows the circular polarizer to rotate easily, while still providing a secure attachment to the lens. The filters worked well – the polarizer worked great to eliminate reflections, etc. and both ND filters allowed opening the aperture several more stops, reducing depth of field. (See included photo examples.) I have K&F Concep filters on two other lenses and have been very happy with those products. Likewise, I am very happy with how these magnetic filters worked on my camera.

I normally have a K&F 82mm threaded UV filter on my lens for protection. My only wish is the filter kit also included a UV filter or skylight filter that I could leave in place on the lens. As it sits now, I need to unscrew the UV filter and screw on the magnetic ring whenever I switch to an ND or CPL filter. I am shortly orderly a K&F Concept magnetic mount UV filter to avoid this cumbersome switch.

What I like about this filter set:
1) The filters themselves are good. I don't see uneven brightness or color distribution on the images
2) I tested it on a Nikon lens with 67mm thread. The adapter ring fits it perfectly. But this is also where the problem comes. I already have a UV filter on the lens. With this ring on, it causes a minor dark corners. With the filters on, the dark corners become more pronounced. I could remove the UV filter, or what I really should do was to order a larger set and then use a step-down ring.
3) The magnet works really well
4) The package is nice and well-thought. It has a belt clip and D ring that allow you to either carry the package on your belt or hang it on the tripod or backpack.

Overall, this is a convinient package of filters that are easy to use. Just be aware of choosing a right size for your situations.

Very good product, the only flaw is that when removing the cap, the filter often comes off with it, especially with the sun visor.

The K&F Concept Magnetic Nano X-series filter set is securely packaged and delivered in a practical and stylish fabric bag with a zipper and magnetic quick-release fastener.
The filters are in separate compartments in the bag and are well protected from damage and scratches, but not from dust and lint, etc. The bag is really stylish and can also be attached to a belt.
The filters themselves consist of a metal frame and multi-coated glass.
The magnetic ring is screwed onto the lens and then you can attach either the filters or the protective cover (also made of metal) magnetically, which is very quick.
The workmanship of all parts is very good, high quality and robust - there is nothing to complain about here.
We don't need to explain anything about CPL or ND8 and ND64, except that they work as expected (CPL minimizes reflections well and the ND filters are very good for long exposure).
Overall, it is a nice set and of course there could be more ND variants, but in principle you can work well with the set.
The price is OK and the quality of the set is impeccable - recommended!

I am not a photography expert but I am very happy with this quality polarizing filter kit. Very easy and quick to install on the lens. It works by a main ring that screws onto the lens, once this step is done you just have to position the magnetic filters on it. It is really practical, I think it is great. The cap is also very pretty. The storage bag provided with these filters is nice and can be easily attached to a belt. The filters are really good. I am very happy with them.