Product review (5 stars): Every Bit as Good as Samsung Filters
Tried these out as an inexpensive alternative to the Samsung name brand filters.  They work just as well, no problems with leakage, water quality, or carbon filter bits getting into the water line.
Just for grins, we cut a used filter open to see what was inside, and it is just a hollow cylinder of carbon matrix.  Not a lot to it, so as long as the form-factor is correct, there's no reason to pay a premium for the name brand.