Is what it is, and does what it should. I noted some having issues with the sand "core" moving about but that is unavoidable obviously since filing the ball completely would likely take the weight to at least 10 pounds. It does not bounce but it's not supposed to bounce! It is highly graspable and in many types of handholds making it very functional as an exercise piece, which is the concept v. a recreational ball. Highly recommended.
Rating: [5 of 5 Stars!]