We had a ball peen hammer in the house when I was growing up, but I never really saw the use in it, since I was not interested in metalworking. I always thought a claw hammer was much more practical, since one could get nails out with the claw.
It seems ball peen hammers used to be more common than they are, now. I haven't seen one in a hardware store in a long time. I'm sure they're probably still manufactured; I just haven't seen one in a while. Since claw hammers are more practical, as I said, I’m sure that’s the reason.