Product review (2 stars): MAKES FRIDGE RUN NOISY
This filter has only one O-ring at the top.  Otherwise it looks just like the one it is replacing.  However, it causes the refrigerator to make a lot of noise - not while filtering water, but whenever the compressor is running.  Had this same problem when I was using cheap replacement cartridges (non-Samsung) and it stopped immediately when I went back to an original Samsung a few months ago.  With this replacement though, the noise has started again.