Nolie got one of these for her "gotcha day" and she gives it
(out of five).
She got the hang of it right away, well sort of, as big and heavy as the "wobbler" is, she still picks the whole thing up and throws it around to get the treats out
Makes for a nice treat dispenser I can leave filled up and on the floor for her to knock round at her leisure, it's not exciting enough that she tries to get all the treats out at once, I put a 1/2 cup of kibble in each night and she messes around with it throughout the next day. If I fill up a tricky treat ball for her, he has it empty within 15 minutes.
We got ours at a "Global pet foods" for $19.99. So far, worth it