As others have said, I have had one in the box for years simply because it came with some set. I never knew what it might be used for. But then a little while back, I discovered a great use for it. I was assembling some cabinets that had numerous button head (I think that's what they're called) bolts. So while I used a ratchet to tighten the nut on one side of the cabinet, I put a bit socket on the breaker for my wife to hold tension on the other. That allowed her more leverage than just holding a screwdriver. I know it's not much, but at least I was finally able to put the little ****** to use (talking about the tool, not my wife).
