Product review (4 stars): Good replacement filters
Not much to say other than be sure that you select the correct filter for your refrigerator model (easy to do) and that you change the filter every 6 months.  If you wait until the water flow begins to noticeably slow you've waited too long!  I live in an area where the tap water quality is poor, so I'm keen to replace the filter regularly.  I'd advise others to do the same.  Paired with a reusable water bottle (such as a Camelbak) this can save a lot of money on bottled water and plastic waste.