I always have a few of that type of spinner in my panfish box. Hard to beat them. I like the Crappie Spinner that has been posted in the other thread, but probably have caught more on these safety pin types.
I remember one winter, my fishing buddy & I were looking for some panfish, and on my first cast, a Carp hammering that little lure. I had put a 2" chartreuse curltail grub on it, similar to those you're showing. Of course I figured it was a bass, but was surprised that a Carp had hit it.
Didn't really matter, on ultralight gear they're all fun to catch.