RE: Speaking of physics - STS thought
I have an STS on my Mathews SBXT and I like it alot.
Like most pieces of archery equipment, you need to play around with it a bit before you can find the best possible position on your bow.
Mine happens to be about 1/32" to 1/16" off the string.
I have my string served in that location to eliminate any wear and tare that might take place.
After a year of shooting with it, I am happy so far.