My reason for buying SnapOn is simple. I have sons. They know death will follow if caught with my good tools. If I notice one is missing, I throw a fit. They're welcome to borrow the nasty old craftsman tools. I used to even have a bucket of broken ones, but the local sears store is pretty balky about replacing them. Back in the day, I even enjoyed taking my wife to the mall and burning time arguing. I kept a copy of the guarantee. Sears said it was my satisfaction that they were guaranteeing. I was the only judge of if I was satisfied. So when I was unhappy and was holding a craftsman too that was broken, I expected to be made happy.
Its not to say SnapOn is perfect. I think they hesitate to replace tools because the individual contractor/salesman must take a hit on the tools he makes good. We used to have a warehouse over in Cincinnati. That was good because you could just carry in a SnapOn tool and get it adjusted. I didn't need to bother because my oldest son and his best friend had the hotts for the counter girl. She was a cutie and liked the attention of young guys. Once I almost got my 3/4s drive ratchet replaced. It was busted, clear as day. But they must have made too much of a disturbance and a manager came out with a bucket of cold water, or the equivalent. He looked at the malfunctioning head, then said he's got a kit for it somewhere. It was probably about the vintage of the pictured truck. He installed it in a few minutes and they came home with a functioning but ugly tool.