Product review (5 stars): Get it.
Get this unit - not the upgrade - unless you have money to burn.  There is virtually no difference.

This unit is what came with my fridge.  LG upgraded the filter at a 50% markup to this one - but this one still does as it was designed.  I don't know the difference in taste between 97.3 and 97.6% pure. If the municipal water is considered safe and this is 100x better than municipal, I can live with that.

I saw a 1 star comment due to 4 day delivery.  You have can get good use out of this filter, with a small family for 8 months to a year.  How much planning do you need to do where 4 days is going to make a difference.  A little unfair and misleading.