Ive broken many craftsman tools, and almost all with my hands. Ive even put a nice bow on a couple of their breaker bars by hand (without a cheater). Ive never had any issue with the snap on tools Ive used at work though, same goes for mac. That said, 90% of what I own are craftsman. The frequency in which I break craftsman tools doesnt justify spending 2x's the amount on snap on's. Especially when a sears is just minutes from my garage.
If I wrenched for a living, it would be a different story.