Product review (3 stars): Good price, bad taste.
The good:
It fits!  I read several reviews saying that it would not fit in the LG LT700P.  It sounds like it was an issue with the size of one of the O rings, but that they've changed the design.  I can confirm that it fits perfectly as a replacement for the  LG LT700P now.  The price is also good and the seller seems to be helpful and attentive.

The bad:  Water tastes terrible, worse than water straight from the tap.  I have a TDS (total dissolved solids) tester that came with a water filter I used to have - cold water from the tap comes in at 48 PPM and water run through this filter comes in at 51 PPM.  I never ran the test on the OEM filter that came with the refrigerator.  Merely an observation - I'm not a scientist and only have a very basic understanding of what TDS means for water quality.  But the water definitely tastes worse through the filter.

The price is good and the seller is attentive and helpful, so if you're not picky about the way your water tastes it's probably a good value.  But me personally, after using this for a few weeks I would rather drink water straight from the tap.  I don't know if I'll try another bargain brand filter and hope for different results or just accept that if I want tasty water I'll have to bend over and pay the price for an OEM filter.