Product review (3 stars): Gifting it.
These work just fine if you need them.  I only bought them because my new Samsung French Door Fridg requires that one be in the system.  The water I was filtering is in Quincy, California where the water definitely does not need filtration.  Best water in the world!  The house with the fridg in it is now for sale so I have no further use for the filters.  The one I have left will be a gift for the new owner.