I actually argued with Eherenberg about this topic before. Not ALL cars can use a vacuum advance and they don't all respond well to the advance at part throttle. Most cars with more cam than stock will surge at highway speeds with vacuum hooked up.
I just prefer to set the base and total timing and lock it in there. I have a long duration high lift solid cam and my engine runs best with 23* base and 34* total with it all in by 2000 RPM.

Gus