Product review (5 stars): Water Sentinal WSF-2 Refrigerator Replacement
I change these filters in my fridge every 6 months as recommended by the manufacturer (Kenmore).  I found a single filter at Sears cost over $50!!!!  I was thrilled to find these compatible filters through Amazon for a fraction of that.  They look the same from what I can tell, and water quality seems to remain the same.