Thank you for the kind words, both Mandy and I are excited about our future with The Sand Trap.
As far as what kind of shoulder turn it promotes: it does not promote either one. It will help with your flexibility, completion of your turn and the sequence of motion coming out of the backswing into the downsing, however whether you are flat or tilted does not necessarily matter, just that you swing in good balance, rhythm and tempo. Does that answer your question?
In response to an earlier post on how it works, there are a few drills that we promote however the most common one is this:
Set up with the Orange Whip in the address position hovering it just above the ground. Start making small swings back and forth very slowly. As you get comfortable, allow the momentum of the Whip to carry you up into your full swing. Keeping the Whip in a constant motion from one swing to another, make about 10-12 swings in repetition waiting for the momentum at the top of the backswing and on the follow through. As long as you can stay balanced, you are improving your tempo, core strength and flexibility, balance, footwork and sequence of motion.
Please let us know if you have any other questions!