Product review (4 stars): Not the cheapest, but certainly effective
I purchased this 3-pack of water filters and I'm definitely impressed.  Perhaps it's the fact that I still had the original water filter from when I purchased my fridge back in October 2010, and the water and ice had a funky bitter taste to it.  The funky taste is now gone, and my water and ice have a crisp, clean taste to them.

These new filters cleared that up since new charcoal is always a lot better than old charcoal.

One thing to note is that these filters are not built by LG itself, by by a company authorized/contracted by LG to make these filters, if that matters to you.

While these filters aren't cheap (around $30 a piece), I ultimately decided to go this route rather than have to deal with some other shady vendors on Amazon, specifically a company that sold Swift Green filters for a low price that absolutely did not match the product description that they had on their Amazon webpage (they stated 900 gallons per filter, but it was only 300 gallons per filter).  I returned those filters and went with these.

So be aware of the other products out there - the marketing for these filters state 6-months or 500 gallons, and that's exactly what's on the box you receive.