Product review (5 stars): Water Sentinel Work Great
At a price considerably less than Samsung's, the WSS-2 is well worth the price.  I was leery from some of the reviews bout noise and gurgling, etc, but I just don't think they ran water through it after install (about a gallon is what I do).  I immediately ordered a 2-pack after installing and using it. (the 2-pack was cheaper per filter than the 3-pack - go figure!)