I have only ever broken one Snap-On tool, a long 3/8" ratchet, doing something beyond what it was meant to do. I put a pipe over the end of it for extra leverage, should have used a bigger 1/2" one but due to clearance issues I could not fit it in there. That's it. I still have all the same tools I bought new back in the early '90s out of school, most are Snap-On. Obviously added to them over the years, but used daily, repeatedly. I just use their hand tools, all my air stuff is IR with Mac sockets. My electric impact is a Snap-On though.... 8 years old, third pair of batteries... been dropped, run over, sprayed with every kind of liquid you can think of...most recently dropped in a pan full of a G12/diesel/filth mix and submerged
Still kickin'.
My only compaint? The sockets' markings were easy to read when my eyes were younger, now I have trouble. The newer versions have more pronounced lettering and are easier to read. And I am told if I ever actually break one of my sockets (I have over 200 of them) I will get the newer one as a replacement.
I do have some chrome swivels that are getting pretty loose, though. Maybe I should start there.