These are top notch well made bags. I bought a set of assassins about a year ago and they have been thrown in multiple events and on multiple surfaces (asphalt, carpet, grass etc.) and they are still going strong. They did slow down a bit as they are used more and more. This is why I got a set of shapeshifters. They start out pretty fast but will settle in for a better speed as they are broken in. BG bags are the best bags I have purchased in the 7 years I have been playing. And I have tried many different manufacturers.