I began my career as an aircraft tech, spent a lot on tools. Had to scrimp at times so I ended up with a few no name or what you would consider Junk brands. My employer paid for annual calibration, guess what the Snap on and MAC scored no better than the others. Just my exp, they all come back with a detailed report and a sticker for the FAA.
I was so ticked off at my snap on guy I never bought another tool from them again. That wrench set me back a weeks pay in those days.
I have found SK and a French Tool Called Focom to be outstanding in quality and warrantied as good as any others. You can find them at Napa in some places.
Search on Ebay, just one thing no one has mentioned. Many people use a wrench for one setting, like lugs or a particular item over and over. If this is the case then dont relieve pressure on the wrench for storage. If your needs vary, like a pro, then it should always be reset to zero when done.
Thats what the calibration co told me anyway.... Take it for what its worth