I don't have the Buster Cube, but I have this orange ball as shown on this link
http://www.omegapaw.com/TrickyTreatBall.html
Cody loves this and will push it around to try and get every last morsel out.
It is not a hard ball and not noisy like the Buster Cube. If it gets pushed into a corner, he easily picks it up with his mouth and brings it back out into an open spot and starts to push it around again.