Product review (4 stars): Filter works well, but is spendy for what it does
These work well in that they keep particles from getting into and clogging the ice maker valves.  Otherwise they are not of much use as our water is fine tasting as is.  The funniest thing is how the ice cubes get smaller as the filters clog up.  The fridge has a filter reminder light but I just watch the cube size and replace the filter when they start to get smallish.