Product review (5 stars): It fits the Samsung RSG257AARS
After looking at the original Samsung filter, I ended up purchasing this one.  I was ironically concerned that the original Samsung filter replacement would not fit my refrigerator based on reviews.  This unit easily installed into my Samsung RSG257AARS with no fitment or leak issues.  There are no taste issues with this filter.  The best part is that it is much more reasonably priced than the Samsung model.