Product review (5 stars): It hooked up easily, followed the instructions to flow about 3 gallons ...
Exact fit and replacement for our Kitchenaid Superba fridge filter.  I was a little worried since these are so inexpensive compared to the proper branded units from Kitchenaid, but side by side to the old OEM unit and these I couldn't identify an exterior, physical difference beyond labeling.  It hooked up easily, followed the instructions to flow about 3 gallons of water through before turning on the ice maker, and things are running smoothly, and the water tastes like it should.