This thing has been awesome. We got it for our pug pup Mabel. It was recommended to us by the traininer at puppy pre-school and has been great so far. We've been using it to feed her meals (kibble) rather than in a bowl. There are a number of advantages to this; she takes longer to eat her meal so we have more time to eat ours! Because she eats more slowly she is at a lower risk of choking. It is engaging and she seems to enjoy using it. It took her a couple of sessions to get her in to it and for her to learn how to get the food out of it herself, but now she loves it.
The wobbler itself is pretty big (larger than I thought it would be - we got the small one) but well made and robust. She bangs it around and plays quite rough with it but it doesn't have a scratch on it. It's also really easy to wash. Would definitely recommend.