Product review (5 stars): GE MWF refrigerator water filter.
I first tried a Water Sentinel WSG-1 filter.  It was about half the cost ($57 for a pack of 3) of the GE MWF filter ($32.45 for 1.)  The problem with this filter is  that it wouldn't fit in my refridgerator.  Working with Sentinel I tried several solutions, but they didn't work.  I gave up and bought the GE and installed it in 20 seconds.