Brent, the point of that box is the ability to program your advance curve with precision. This is done by locking the advance out at the dizz and using the retard function of the box for everything else, including start retard. Right now I have my dizz locked out and set on 36 degrees. I have the box set to retard the timing back to about 10 degrees until the revs pass 1000 rpm. Then a slope to have it all in by 2800rpm. The box is wired for a MAP sensor so you could do a vacuum advance curve as well as all sorts of N2O/Turbo/SC stuff that I'm not using. I haven't had it on a dyno yet so I'm not sure how close I am to optimum either but it sure does feel good!
Steve