I bought this, the smallest chuckit, for it's portability, but it's size completely ruins the purpose of a chuckit. This is no better than just chucking the stupid ball with my arm. And I don't pretend to understand the physics behind it, but it takes a lot of user effort to get the ball to leave the holder. You have to be a master of the wrist flick, which isn't a problem with the bigger chuckits which create enough inertia to force the ball out with a little flick of the wrist.