I had problems running an experimental in the advance mode. No issues in the normal fixed timing mode. Surefly provided lots of assistance but we never sorted it out. Runs great in the fixed mode. Local shop has installed 3 dozen or so most running in advance mode with zero issues.
I have been running my SureFly on fixed timing mode with no apparent issues ~ 300 hrs ago. Mechanic is switching it over to advance mode now. It will be interesting whether I see a noticeable change.