Personally, I have had a few Track balls crack on me. I think that I ran through a Triton Heat, 3 different Freaks, 2 Threats, and now my Rule cracked as well. But I can say that I have had equal issues with other companies' equipment as well. Generally by the time that these balls have cracked, it has been close to replacement/retirement time, except for my Freaks, which were all covered under warranty.