Dan, and all--let me rephrase. I think to execute the Stack and Tilt move exactly as shown, you need to be an athlete. I have seen the videos of ST swingers.
Lets break it down-The "Stack" part of the swing come from the take-away where you 'stack' the weight on the left leg (for a right-handed golfer). The "Tilt" part of the swing come from the fact that you wind up tilting back and moving the weight to the right foot (at least in all the models I have seen. Wier made this move at the Mercedes this year). Those two moves are the very definition of a reverse pivot. Weight on the left side at the top and the right side at impact. So at this point, at impact, you have your back tilted backwards and your weight on your right foot. You have to do something to get back to your left side so that you do not, literally, fall down.
When Wier was shown on the range at the Mercedes this year, he had a massive arch in his back when he was swinging, especially so when he hit his driver. Thats why I say it will give you back problems.
NOW, I do think that if you can manage to keep the weight on the left side (Even though I had a PGA Master Professional Instructor tell me that you basically can't make a golf swing around a stationary pivot point as long as you swing with your feet apart) THROUGH THE WHOLE SWING and never let the weight get back onto your right side, its a good move. But from what I have seen, that is not a Stack and Tilt move, its more a Mac O'Grady move, and he does not teach exactly Stack and Tilt, more like an early version of it. If you can Stack (and not Tilt) its a good, simple move, but for the most part, you can't, and so far as I know, its not exactly what they teach, just an older form.
Jim Hardy's One Plane:Two Plane method, I feel, is easier for an average golfer to understand because it doesn't try and apply the same mechanics to every golf swing. There are different sets of positions and fundamentals for what can be basically categorized as "flat" and "upright" swings. So long as someone can tell which he is, and there are definitions all in the book, you can easily work through the process on your own.
I do not judge the merits of a golf swing based simply on what works on the tour. Annika Sorenstam and David Duval used to come to impact with their eyes looking 5-6 feet in front of the ball down the target line. Most wouldn't teach that to students. Jim Furyk makes two huge loops in his swing. I bet no instructor would teach that. Guys and girls on the tours have so much different (read better) feel and control of a golf swing that they can really make nearly anything work.