I was skeptical at first as my Lab/Shepherd mix makes it his job to destroy anything in ball shape or stuffed, we have bought the Kong tuff balls and just about every ball that says it is tough and he finds a way to destroy it. He loves tennis balls and will play with them for about 5 minutes then eat it. Now he is a aggressive chewer, but he is not able to chew the original brand kongs, yet they only come in honey comb shape and he loves the ball shape.
I purchased this on vacation at a fancy dog boutique on the recommendation of the shop that they have never had one returned because the dog ate or destroyed it. I brought it home and my dogs were in love. They both loved it so much I found a local shop that had them and bought another for my other dog. So far so good.