Product review (4 stars): Works well
In some ways, refrigerator water filters are a huge scam: appliance makers add this "feature" to their refrigerators in order to turn a big one-time purchase (refrigerator) into a big one-time purchase plus a lifetime of costly filter replacements. And, most of the time, the filters do very little-- municipal water is already filtered, and rarely contains the poisons that the filters claim to remove. (There's an asterisk on the box to that effect.)

GE is one of the least "evil", at least; GE normally ships a "bypass plug" with each refrigerator, so if you decide that you don't need a filter, you aren't stuck buying them just to keep the water flowing.

There is, however, a good time to have one of these filters.  We've already had a few events in the Boston area where a water-main break allowed less-than-clean water into the pipes-- and it was more than a few hours before the "boil water" word got out.  If you were drinking water during this time, a cyst-reducing filter like this one could help protect you and give you a little peace of mind.  GE's filters, while not inexpensive, are less so than some other brands.  You can order a 3-pack to save a bit more.