Product review (4 stars): Fits as described, lasted about 6 months.
It fits my Whirlpool fridge.  It lasted about 6 months.  Our water contains a lot of chlorine (the tap water smells like bleach) and calcium.  Removes the icky odor and flavor of our water, so that's worth it.  The price was a little steep, just ordered a 3 pack of another brand this time for just a few bucks more than what I paid for this single one.  Hopefully they'll work just as well and last just as long.