I guess I'm odd--I always personally thought S&K was THE name in sockets. Best Granddad had, best I have. I've thought Snap-On was always overrated, and overpriced.
I have a bit newer set--mid '80s I think. 1/4 drive, but no breaker bar. My metric set has a proper S&K driver, but in the SAE (which was mostly incomplete), I added a Challenger that also doubles as an extension (1/4 female slot in top of handle).
I'm really jealous of that $3 score! Great price! S&K no longer uses those solid steel boxes. Now, they use plastic cases on which the latches break very easily. At least that's my experience with tool cases other than S&K.