That handle design has the virtue of being self-tightening. Over the years, I've replaced a few hammer handles that had shrunk too much for salvation with yet another wedge.
Yes, if the head comes loose a quick tap downwards on something solid re-seats it.
Though they are perfectly functional, the round handle feels a bit lacking compared to a wooden oval section shaped handled hammer (but then a wooden oval section hammer feels lacking compared to a modern "soft grip" hammer handle!).
If you were in the middle of nowhere they would be a good style as a user, otherwise give me a modern claw hammer ;-)
