The J85 was designed for the ADM-20 originally, but has been a very successful engine over the years; in the civil world, the same engine without afterburner is the CJ610, and was adapted into the CF700. The engine and it's variants has a very successful history.

The early J85 developments for drone/missile use were built with lower grade materials; and are not the same as the J-85's and CJ610's used for manned aircraft. The notion that the J85 is a missile engine that wasn't engineered to last, is a myth.