Hey,
I tried the swing for a few rounds. It actually is somewhat natural for me because I have always struggled with too much weight on my left side. It allows for a player to worry less about weight transfer from the back foot to the front on the downswing, and keeps everything "centered".
I found it very consistent with a fade. Drawing the ball was more of a challenge when trying the S&T for the first time.
After a few rounds I stopped doing it. I'm no expert on it and wasn't exactly sure if what I was doing was correct.
I can tell you one thing about it though:
I have always loved Badds's swing because he stays centered so well and his HEAD DOES NOT MOVE AT ALL!
I also noticed, that when weir was stuggling prior to the switch, his head would drop on his backswing because he had too much weight on his toes. Watch him now, his head stays at the same height using the stack and tilt swing!!!
notice his head dropping here (slight):
YouTube - Mike Weir - Down the Line
much Less drop here (more recent):
YouTube - Mike Weir Driver Swing