Jeepnut, I guess the best benefit for myself is knowing my string is stopping at the measured brace height location (idle bow) or at least very close to it. Instead of traveling forewards during the shot sequence.

If your shooting a bow under 7" brace height this improovement will help you get by with a larger sleeve and you shouldn't experience the wrist string slap if your form should ever fall short of "good". My Z-light (6.5" brace) will give a good form reminder every now and then. I'm hoping an STS will cure that from occuring.

The STS I've put on my Patriot hasn't improved it much. It is plenty smooth by itself.