Product review (5 stars): Filter working fine
Decided to go with the Samsung product, which is NSF 53 certified, whereas the others, even though they are priced lower, have a lower number of certification.  We did turn the fridge water line off to switch it out - otherwise the pressure makes it hard to get the new one locked back in and then you do have to run the water for awhile (7 water pitchers worth) to get the water tasting normal.  There was also some black stuff in the first pitcher.