Also I really hate to double post on this, but I wanted to make this a separate post as a warning on the Pyramid toy.
From this website, http://bauhoundhaus.blogspot.com/2011/02/kongs-new-wobbler-vs-nina-ottossons.html:
"The Pyramid has a serious design fault. It has a seam right before the weight at the bottom that after extended use can crack. Once it is broken, it is broken. I have duct taped one together, but it’s not the safest way to deal with the issue when it’s a toy you plan to leave alone with your dog. I have attempted to crazy glue one, too, but the glue broke with one slam by our toy tester, Kiah. This design fault, however, is not the only challenge to the Pyramid – it only has the dispensing hole to fill the toy with. When you want to put breakfast in it or any quantity of treats or kibble, it can be frustrating and time consuming."
I was considering the Pyramid, but now I think I'll just save up for the Kong Wobbler instead.