Not really top of the line, but good enough for most things, and lifetime warranty w/o receipt if broken.
I used Craftsman for most mechanic's tools, but for a few things that really mattered (line wrenches, screw drivers, 5/16" combination wrench) the upgrade to MAC/Snap-On was worth the extra few (hundred) bucks (IMO).
Mechanics I knew all used Snap-On. They told me that the difference is in the balance of the tools. Craftsman made fine and rugged tools but if you were going to have a wrench in your hand all day long you wanted it to balance properly or you would wear yourself out working with it.
SK are good wrenches, too. There have been a lot of tools hitting the pawn shops lately around here, and some are good ones.