My puppies love these for lunch! I work from home and this is a great way to turn lunch into a brain teaser so they are busy flexing those brains and not trying to cause mayhem. They get so excited when I pull these out to fill up.There are not really any downsides to this product, but I do wish it came with a funnel of some sort because the opening is smaller and hard to fill with an average kibble scoop. The toy itself is pretty durable, I have 4 German Shorthaired Pointers 2 full grown adults at 65-70, 1 year old at 60lbs and a 10 mo foster at 40lbs and the 2 that I have only have some minor chunks in them. My 1 year old is a super chewer and we left him for about 30 minutes unmonitored with the first one once and he was able to get a large chunk off but that is our fault because we know he is a super chewer and so smart so it only takes him 10-15 minutes to empty the treat ball and then he likely got bored. We have repurchased this so that we have one for every dog!