Product review (4 stars): Its a water filter, and its pricy
I purchase these for my LG French Door refrigerator, they last about 6 months before they need replacing.  They are very easy to change and seem to make the water taste decent.  My only issue is they are pricy.  Occasionally you can find them for about $25 each, anything more then that you might as well look for an off brand on other websites online.  Honestly I couldn't tell any taste difference in the water quality between the LG brand and the offbrand.