Product review (4 stars): Great Filter
These filters do an excellent job of filtering out the foreign material from tap water for a refrigerator water and ice dispenser.  The water definitely tastes better (and we have very pristine water from a natural aquifer).  Unlike knock-off brands, these are NSF tested and certified.  Since this is drinking water we're talking about, I wouldn't recommend those knock-offs that say they're "made to NSF specifications" but which are neither NSF tested nor certified.

I wish these were a bit cheaper, but I compared the Amazon price to the price at my local big box DIY store, and the DIY store was 50% more expensive.  In fact, their price has almost doubled since I first bought my refrigerator.  This last filter lasted for almost 9 months before the "replace filter" light turned red.  The water flow has been pretty slow for about 4 months, though.  This is the first time I have actually let the filter light go red.  I normally replace these  at no more than 6 months when the water flow is less than half of what it originally was.  Bottom line - these filters last quite a while.