Product review (5 stars): OEM quality, easy install, good durability
This is a high quality, OEM replacement that is used in our GE fridge.  The fit, finish, and durability is top notch.

We changed the water filter when our refrigerator told us it was time.  You will also notice the flow of your water will slow when it needs to be changed.  If a lake feeds your water supply, you will start to notice some of the lake smell returning.

Simply twist off the old unit (and pour the water down the drain), twist on the new unit until it clicks, then run 40-60 ounces of water through it to prime.  You will know it is ready when it stops spitting air.

There is documentation available showing the efficacy of the unit, but I have not verified it.  I trust that GE has taken the proper steps to do so, therefore I trust spending a little more on an OEM unit.