I ordered this edge guide to go with my 618. I have used it to route dados, rabbets, through cuts and some straight inlays. It make it so much easier. Take light passed and be sure your work is secured and you have a straight line. It makes setup 10x faster for routing the sliding dovetail shelves I built. Take the guesswork out and line it up by eye, secure it, route. One tip, be sure the fence is on your waste side of your route, if applicable. Any slippage or missteps will be routed away later, Saves headache on those expensive chunks of hardwood.  LOVE this guide.