After a few trips to the range and about 5 rounds with the Stack and Tilt under my belt, I can say that this swing is starting to be grooved.
I have never hit so many consistant, on target shots with my irons and fairway woods as I have with this swing.
I am having some consistancy problems with the driver, pop ups and pushes, but even that is straightening out too.
I have gained about 20 yards off the tee and 10 yards more with my irons. Once you get used to the leg work required to keep the weight to the lead side on the backswing, this swing is a peice of cake.