Product review (5 stars): Does its Job Perfectly.
Awesome filter... am I really writing a review on a filter??  Yep, when the filter does its job perfectly.  Tried the cheaper ones and something didn't taste right.  Replaced my filter today with the 4 and its great. Water is clear, clean and tastes like it has no taste.  Cold and clear water, just what my family needs.
Be sure and install it fully (read your manual). If you don't the water won't come out  and you will know its incorrect.
 I had a bit of air in the line so be ready for a minor explosion of air and a bit of water.  Be sure and prime the filter clear by running an appropriate amount of water thru the line. Unless you prefer milky colored water for your first few glasses you will understand my comment.