I have always found that a dog left alone that is very curious is likely to shred anything that has food in it, that can be shredded. I would have thought that having anything with several sliders and moving parts was likely to be a choking hazard?
I bought my dog a simple treat ball with small opening, but after puppy stage he lost interest in it, plus I am home most of the time now anyway.
All I can add to this is check to see if you think that the toy will withstand whatever assault your dog brings to it!