Product review (4 stars): Works fine -- it's a water filter...
How do you go about rating a replacement product?  It was time to replace my water filter so...I replaced my water filter.  Knowing what was needed, I simply had to find the best combination of price, speed, and trust from a vendor.  That is where Amazon comes in: fair price (especially when considering shipping), very quick with Prime, and I have never had an issue going through them.