Product review (1 stars): They were completely non-functional
I have a KitchenAid fridge, which is compatible with Type 4 filters, such as these.

A few days after installation, attempting to dispense water from the fridge would fail, and the fridge would make a pounding noise like a jackhammer.

After calling a repair person, the issue was quite obviously with these filters.

The filters cost $80. The repair visit cost over $120. I am $200 in the hole thanks to this lousy purchase. How awful.