Sandy's rules Saints, mystics and hero points

[TRose]

I think Sandy's rules on Saints and Kralorean Mystics look interesting( They on Philip HIbbs RQ page) and am thinking of allowing my players to buy them using Hero points .
To Purchase a Saint it would cost you twice the Hero points as the power listed, so a Saint that would cost 3 power points could now be purchased with 6 hero points. For Mysticism I'm still up in the air about How many Hero points it should cost to buy one mystic points.
Would like to hear back from some of those familiar with Sandy's rules and what you think.