I think they're generally worth it, though for a variety of reasons. They make most bows much quieter, and that's reason enough. They also do a lot to absorb vibration and deaden the felt-shock to your hand, which is also great. But to me, here's the biggest advantage. I accidentally dry-fired my bow a couple of years ago. The string broke, and a couple of smaller bolts broke. But the rest of the bow was unharmed. I had the string-suppressor on my bow and I firmly believe that it absorbed enough of the shock that it saved my bow (minus the need for a new string and two small bolts).