Product review (5 stars): Works great!
I am very pleased with this water filter.  It was easy to install, and it is a lot less expensive than the Samsung brand.  Like a few other reviewers I did have some water leakage, but when I investigated I found I had the lock knob completely vertical, which I thought was locked.  To make sure it was really locked I turned it clockwise, and it moved another 1/4 inch or so.  That stopped the leak, so heads up - turn the knob clockwise until it stops, which might not be straight up and down.