My girlfriend and I each have a! I have been practicing WT and Brazilian Jiu-Jitsu and boxing! We are both very pleased with the mouthguard! it is easy to use. we can breathe pretty well and so far we do not have all the teeth in the mouth! Super shock resistant! Unfortunately, we did not test any serious opportunity to the mouth guard in "real combat". but just great for exercises and training. I would buy it again and again and also recommend it! :)