Professional grade tools aren't just '**** that doesnt break'. I read/hear a lot about 'lifetime warranties' and Chinese tools that 'never break'--drives me nuts. The difference between a pro tool and Stanley is that Professional tools are designed for effectiveness, durablilty, ergonomics, etc.... A wrench is just a wrench until you have to use the sum ******* 8-12 hours a day in confined spaces.
Stanley tools are **** btw, that is, when used in a professional setting.