Product review (3 stars): Ok aftermarket replacement.
I've purchased this item twice. First time no problems (although water started to taste bad only after about 4 months of usage compared to the 6 suggested). I got another one recently and water tastes very bad! I purged the system as recommended and a few days have gone by and no solution. It may be a defective unit so I returned it. I got the original GE replacement instead as it was around the same price and water tastes great again. I am giving it 3 stars for the experience.