This is one you can't compare. I have a IJ and love it for the theme, I also have newer Stern games and love it for the flow and feel. My IJ never has problems. My stern's do have sometimes (opto's, flippers hang) nothing serious but they have problems. The issue I have with the stern's is the softness of the wood of the playfield. In time I get a lot op dimples in de playfield, my last Stern is a 2010 SM so maybe that has been changed.