From personal experience the MD products are built like a brick s*it house. I have 1600 hours in DC-9's with the Navy and the ones I am flying were built in 67/68. As old as me. We beat the the heck out of them during training, multiple touch and go's and we even do approach to stalls on every training flight. I have flown one around the world and made too many translants and transpacs in em. They are very reliable from my stand point.