Product review (5 stars): Two-fer filter pack for a great price...
I ordered these on the other recommendations, and so far I'm a happy camper.  My old replacement was years old, so the water pressure had dropped coming out of the dispenser and I didn't even realize it...  The filter was actually easier to install than the other replacement and seemed like a better fit.  The instructions suggest you put about 2.5 gallons (5 minutes) of water through the filter, but I only had the patience to do about a gallon or so (an only so many plants...) :).  The water tastes great, smells great, is great...  And for the price (about half of full retail for two) it's the best bargain...  Just buy them.