I'm not a tech, so maybe I should not say anything but... I am still not sold on the idea that they are absolutely needed, as many are. I got a slap sound with the STS that apparently none of its ardent users can hear. Still, it did effectively kill the vibration in one of the bows, and perhaps reduced it a little in another. I still am amazed that many fans of these things shoot very quiet/ vibe free bows to start with, then say the STS, CSS, or whatever really made a huge difference. The only way to make some of these bows quieter is to hang them up and go do something besides shoot.

As far as the other thing goes, well, again not a tech here, but I have been paying close attention to what has been posted for several years on different boards. Len in Maryland does not favor the STS, as far as I've seen. Mike Carter of Missouri does seem to think highly of them. These two guys are, to my way of thinking, the two most knowledgable techs that post on archery forums. One likes them, one does not. If you like what it does, buy it. If not, don't. Almost any well tuned bow will likely shoot better than its owner can, with or without.