Product review (5 stars): Works Great
I've got a GE side-by-side fridge that we bought in 2010.  GSF25 model.  My filter did not come with any additional rings or seals outside of the O-Ring that sat on top of the filter (some people mentioned they had to use additional included seals to get this to work properly). Installation was simply: Turn old filter 1/4 to the left, pop it off (a small amount of water may squirt out). Line up the new filter, turn it 1/4 turn to the right. Popped right in and sealed perfectly. Not a drop of water dripped. Filled up a large cup about 20x to get the air out and clean out the filter.  Perhaps the people that are having problems have older models? At almost 50% of the Amazon price for the genuine GE filter, this seems great. The water tasted nice too, like bottled water.