A handy anecdote from my apprenticeship: when we were issued with our basic toolboxes, a lot of us complained that they weren't a good selection of appropriate tools (quality ranged from Stahlwille to Stanley, Koken, Daiken, Knipex, etc). Some asked why we weren't just given a list of tools to buy ourselves and the following story was told.
Several years earlier, the company had handed a list to apprentices for tools they would need. One particular apprentice had bought rather cheap, Chinese manufactured tools to save money. On this particular day, he was helping build up a Rolls-Royce RB211, which was done with the engine vertical. Perched on top of the engine, torquing up a major component using torques in the hundreds of ft lb applied through cheap sockets, the socket failed and snapped into 4 separate pieces which fell through the fan into the engine. All present heard 3 pieces hit the floor below... meaning there was one piece missing inside the engine! A full strip down of the newly overhauled engine was necessary to recover that piece. All for a cheap socket!