It works just fine. Not a game changer. It is just a hip stem. In a crowd of hip stems that also work. It will meet the needs of surgeons who believe you need a collar for the stem to work. It will meet the needs of a surgeon who believes you need a shorter stem to be able to put it through the front. It will meet the needs of a surgeon who believes it has to be all white to work. It will meet the needs of a surgeon who has to have all the above but also wants to use the robot.