When comparison shoping you have to know abit more about the older saws. There are various models of the RBI220. Is it the older version with the barrel clamps, if so skip it. Is it a VS model or an older 2 speed, skip it What is the condition of the saw?? As far as the Hegner goes, again what model is it?? How big is it, and does it have the upfront blade tension lever. If it does not skip it. You know what you are getting with the Dewalt and brand new with full warrenty. None of the others have a warrenty. Now if the RBI is a Hawk 220vs and in good condition, that is the way I would go. Tough call when you are buying a used piece of equipment though. Just my 2¢