La bella double ball for obvious reasons are perfect for headless guitar users, as in my case it goes perfect with my Holdsworth Headless models from kiesel guitars, in fact the man himself used it a lot in his headless guitars,
the double ball ending makes it easier and quicker to change strings, actually you can change the whole set very fast, as in a normal guitar one would be still changing the first string,
great option for headless guitar player!