We have one, but we don't use it during feeing times. I suppose you could, but you'd probably have to fill it a few times.
It's made of hard, durable plastic, which is great for doberchewers. BUT...if you have hardwood and/or tile floors, be prepared for quite a racket! I just found this product at Petco
http://www.retailpets.com/amazaballs2.html, it's similar and made of rubber. JW Pets has some pretty durable toys, but even still, I'm careful not to let Tess chew on it too much after she's gotten the treats/kibble out.