We've had it in size M/L for years now. It's not a chew toy, but a throwing ball, and it's great for practising fetch. It should only be used for that, because the grip rings are perfect for dogs who love to chew and will easily bite through them. So you shouldn't be surprised if it doesn't last long.
My Shepherd/Husky loves this ball – it's not only extremely tough but also great for playing fetch! The only downside is that the squeaker breaks quickly, although for our use that's actually more of an advantage!