Product review (4 stars): Almost no complaint
It's a standard unit that fits all GE refrigerators.  Only complaint I have is that it is expensive for something that they recommend you to replace every 6 months.  GE also has a program where you can recycle the used unit by sending it to them, but you have to pay for the postage yourself.  Personally that sounds ridiculous.  From what I can tell the inside is a simple block (cylindrical) of carbon, a very simple and common type of water filter.  So unless you live in a place that has no treated municipal water, it's really not necessary to replace the filter every 6 months.