Product review (5 stars): The first replacement filter I bought after getting a new ...
The first replacement filter I bought after getting a new refrigerator was an off brand.  It was much cheaper but only lasted about 3 months and the water was painfully slow.  I upgraded to the GE model and saw a remarkable improvement.  I'm usually a store/generic brand person but for this product, paying for the official GE filter was worth the expense.  I'll only use GE filters going forward.