I ordered this ball a few weeks ago, and here is my personal take on this toy:
The holes are just big enough for my guys to get a good grip and - literally - wedge their teeth in there really tight. I had to rescue Faust several times because he was in a panic when he couldn't drop the ball. Sepps teeth also got stuck, and it took some yanking and pulling to free him - he was NOT a happy camper.
The ball is also fairly big, and once it gets stuck it's really hard to remove if the dogs' jaws are clamped down firmly... there is no room to maneuver it, or have the dog open his mouth wider to get it out.
I envision some mouth/tooth injuries and a hefty vet/dental bill if we continue to use this product in the future, because the boys LOVE chasing after it.
It IS "Unbreakaball"... I will give it that. It would take a sledgehammer or a bulldozer to destroy it.
If you ever decide to make to make this ball in a smaller size w/bigger holes it would definitely be a plus as far as my household is concerned, and I would give it another try.