I like the shape of this one (and my dogs seem to like to carry and throw it because of its shape), but the opening for it is too large and not adjustable like with the "Buster Cube." What this means is that kibble comes out really easily--which is fine if you want to make it a very fast game for them. But I find it's too easy and too fast a game for my two little ones (35 and 25 lbs).I have the buster cube also and like that one better.