I have not yet been able to justify using a more expensive filter system like Lee. I live near water and like longer exposures to smooth out the water for sunset shots. This makes the trick perfect for my use.

A good quality "square" filter system for photography. One thing to note if you are considering this system, the adapter ring kit does NOT come with a 55mm ring at this point. I raised the issue with K&F through their Facebook page and a response to that said the point would be shared with the appropriate people. Who knows, maybe it will come with a 55mm ring soon. If you need such an adapter for one of your lenses, you have to buy it separately. That means it's well made and sturdy enough to last for years I think and apart from 55mm there's a fair choice of adapter rings in the kit, eh

Put off by the price of Lee filters and holders I decided to try the K&F kit. The quality of manufacture and packaging feels premium and with the Reverse Grad ND filter designed for morning landscapes, I haven't noticed any ill effects on my Nikon D750 images. The filter storage boxes are great. Just make sure you store the filter in the fabric to avoid scratching. The filter holder is beautifully made and finished and unlike one reviewer I had no concerns about how well the filter was held. The full set of adapter rings included in the price makes this a great value when using a range of lenses and a range of filters.

The system is very well built and they sell frames to take advantage of other square filters you have from before.
It comes very well presented, in a case.

Unfortunately, the original box of the product comes with the Amazon label directly attached to it, and opened.
Very bad on the part of Amazon, which sometimes sends cardboard to wallpaper the house with an SD card, and in this case it is worth keeping the original box, they send it unwrapped

Much better than the bulky Lee filter holders. Filter seems to be working well so far.

Replaces a system type Lee filter when you need to adjust its ND filter to a reduction in brightness during a longer break. Polarization is a plus that works well

The system is very well built and they sell frames to take advantage of other square filters you have from before.
It comes very well presented, in a case.

Unfortunately, the original box of the product comes with the Amazon label directly attached to it, and opened.
Very bad on the part of Amazon, which sometimes sends cardboard to wallpaper the house with an SD card, and in this case it is worth keeping the original box, they send it unwrapped

The system is very well built and they sell frames to take advantage of other square filters you have before.
It comes very well presented, in a case.

Unfortunately, the original box of the product comes with the Amazon label directly glued on top, and open.
Very bad on the part of Amazon, which sometimes sends cardboard to wallpaper the house with an SD card, and in this case it is worth keeping the original box, they send it unwrapped