Product review (4 stars): Good generic brand.
I buy these to use a replacement filters in my Kenmore fridge.  The two pack are just about 2/3rds the price of what a single Kenmore certified filter goes for on Sears.com.
As always, with any generic brand you probably will notice a slight quality downgrade, but with the cost savings and how long the filters last, I would still go with these.  And, unless you're very picky about water filtration (like I am) you probably won't even notice a difference (like my roommate).