I love these vibration dampeners, best ones on the market. They cover more area of the racket so they are more effective than the smaller button style ones. Highly recommended.
I have purchased many of these dampeners over the years, and they are the BEST in my opinion! Some people have complained about the leakage, but it's an easy fix to just cut off the end, clean and re-insert the clip.. and they last forever!
The Gamma Shockbuster has long been my favorite vibration dampener. Unfortunately, they are not as good as they used to be. They are a bit thinner and smaller, and seem less durable. Still a good product, but they don't make 'em like they used to.