These engines are ‘models’ for hands-on gearheads. They are big-boy toys. Do you guys who are critical have any machinist experience at all? Hire one to build an H75 from scratch and see $6K disappear from your bank account. If you have the knowledge and build one yourself, the cost of the machines and the required tooling will be close to the price of a car. If CNC equipment, think second mortgage. Jin’s products, courtesy of the price of Chinese labor and restricted value of the Yuan, are an incredible bargain. If you buy his engines and they don’t make you happy, or you don’t have the ability to tinker with them, it is probably a good idea not to buy them. Only in imagination can you expect to get a Swiss watch for the price of a Timex.