You get what you pay for, or do you. Local overhaul might be the best overhaul mechanic since Charles Taylor so what do you get. If you sell your plane what kind of warranty goes with it, if any. How many people that are looking to buy a plane put what value in a local overhaul over a factory overhaul. What did they replace with new in a local overhaul, new cylinders, grind the crank how much, did they do the mags, starter, fuel system. If it needs work will the shop pay for anyone else to work on it or tell them to bring it back to them for repair, if that is the other side of the country that might be a problem. Sometimes your better off selling your plane with a high time engine and set the price accordingly.