Product review (4 stars): Great filter for the money
Definitely a great value compared the name-brand OEM filters.  I was concerned with the potential quality of the product after reading other reviews, but I have been extremely pleased so far.
-Replacement: I had no issues removing my existing filter or installing the new Supco filter. This filter did not have any leaks, and seems to fit perfectly in my Maytag French door refrigerator.
-Water flow: after installing the new filter, my water flow improved significantly, probably to twice the rate of the old Pur filter.
-Filtration: initially, the filter left a significant amount of particulates in the water; this was probably the initial carbon getting flushed out.  It took longer than expected for the water to clear up, but after several gallons, everything looks good.
Taste: admittedly, my tap water already tastes okay.  The good news is that the filter has not changed the taste of my water in any negative way.  It seems to remove the chlorine, and does not impart any metallic taste into the water.
Shelf life: the box does not provide an indication of the capacity for how many gallows of water this will filter.  The box says to replace every six months, so we will see how long it lasts.  But for under $20, I still consider this to be an excellent purchase.