Mine is the 718, have the helical head, and added a 6" flange for dust. That 6" flange is a great addition. Pretty thin metal to weld, but a wire welder worked good. The helical head is great too. I have gone to just planing lumber down to 7/8" and glue up panels at that thickness, then use my Griz thickness sander to grind down. Makes the panels as flat as any.