Sklansky's "improving the system" anyone tried this?

I tried a system proposed by Sklansky in Tournament Poker for Advanced Players in a 5+0.50 45 player SNG this evening. The main point of the system was to go all in or fold every hand. (you choose good hands to go all-in with) I played 3 hands prior to heads up play and doubled up, tripled up and doubled up in those hands. I played regular once I was heads up and won the whole thing. Has anyone else tried his "system" if so what were the results?