The only issue with any of those "fits multiple things" is that I think
they don't fit anything as well as the actual correct wrench. I needed
a metric external torx socket to get to a really tight bolt, in a really
bad place. No one had one locally. Sears had one of those miracle sockets
that's supposed to fit multiple things, including torx. So, I tried it.
I was smart, so I started out with trying it on some other torx bolts
that were easily accessible, where I didn't need the socket. It worked
just fine, but as I said they were really tight. So, finally and used it
on the one that I really had to use a socket on. And of course, as I
put pressure on it, it finally slipped. I'm sure if I had the actual
torx socket that would not have happened. At that point, since the torx
was nowhere local, I decided to take it apart in a different way, that
made it more difficult, but didn't require removing that one bolt.
I'd still use those multi socket things for typical stuff, where it's not
super tight, not in a bad spot, where the consequences of rounding it off
aren't profound. But for a critical thing, there is no sub for the right
wrench.