Can't say if it's a good deal until you know what kind of condition it's in and how well that particular one runs. Since you probably won't get a warranty with it, you may have to send it to England or Germany for repairs (if anything is needed). The engine weighs 2700 grams bare + 600 grams for the magneto ignition. If it has an electronic ignition, add 200 grams instead of 600 grams. It most likely is the magneto motor weighing 3300 grams. Engines that weigh 7 lbs + usually work OK in planes with around 97-106 inch span (25-30 lbs). I think the Mac is a little too heavy for a 30% plane, but would be fine in one of the new H9 33% ARFs, like the Extra or Edge.