Product review (5 stars): I do not like paying for the higher priced items like these but ...
I bought a new LG refrigerator and did a lot of searching around for other carbon filters. I do not like paying for the higher priced items like these but it seemed like the general consensus was to just pay the extra money because of the NSF quality that you get with these.  Other reviewers for the third party filters also said there were leak issues which I definitely do not want to experience.  I think it is worth the money to just buy these instead of some of the cheaper ones as much as it pains me to say it.  It is better if you buy a 3 pack though because that will save you more money versus just buying 1 unit at a time.