So far, this is my favorite dampener on the market. It reduces vibration and shock but doesn't make the racket feel inert. It doesn't come flying off your racket if you hit a ball too far below the sweet-spot (though one side or the other occasionally becomes unattached). And so far, I've yet to have one break on me after tens of hours of tennis. The cost is also totally reasonable given that it's durable and not easily lost.
It takes a few minutes to figure out how to install it the first time (the design is slightly more intricate than it appears), but once you get how it works, it shouldn't take long.
All in all, I highly recommend giving this vibration dampener a try.