Well, I'll grant you that the compels might be nasty, but I guess it also depends on whether you allow it to 'bypass' the Toughness powers of just about everything or not.
What kind of compels do you envision? One that I could see coming up several times, if not often, would be for the PC to 'spread the wealth', leaving Outsider-related writings around here and there. Particularly hard on White Council mages, if they manage to skim it by accident :p