Chuck It Erratic Ball

I rarely find a new and interesting toy that I feel I want to buy for our dogs.  Don't get me wrong, I buy TONS of toys, but often because they're cute and it makes the dogs (mostly Murray) happy, which makes me happy.  I have recently come across one ball that we do not yet own and I think would be a fun ball to use in the yard or a field for some added exercise....which we need!  It's a ball that bounces "erratically" when you throw it so your dog cannot exactly gauge where it will land.  My boys like to chase things, so having a ball to chase in different directions seems right up their alley!  It comes in three different sizes...small, medium and large, and the smaller ones fit their launchers that they also sell.  I am looking to buy the large one without a launcher.   When I pick it up and try it out, I will report back with what we thought.