Product review (4 stars): ... over 7 gallons of water and it still tastes like water that's been sitting in an old water bottle ...
I ran through over 7 gallons of water and it still tastes like water that's been sitting in an old water bottle too long.  Replaced for a new one, if its still bad, i'll try a different brand.

Updated 4 Stars - they sent out an additional one with no hassle overnight, which is working as intended. The first one must have been an anomaly.