I've been using my atc to rappel even when I have my safeguard with me bc it's much more smooth for me. Descending with the safeguard just seems awkward and jerky. I've only used 9mm htp so far but will probably go to oplux at some point. Sometimes I use a separate tether, sometimes i clip a Kong above the safeguard and remove it. Seems like alot of unnecessary gear but the safeguard twists and makes rappelling uncomfortable for me