Product review (5 stars): Worked very well and easy to install.
Arrived quickly and installed easily.  Huge savings over the Kenmore brand filter.  Some people reported a lot of grey or black water before the water runs clear..  I only had a couple glasses of water until the water was crystal clear.  I replaced my cartridge because my old cartridge's "O" rings failed and leaked.  Would have been a real mess if my basement was finished, as it leaked for several days before I noticed it. Since I have exceptionally good tap water I delayed replacing the cartridge.  Word to the wise, don't delay replacing your cartridge too long, or you may have a mess on your hands! .