Obviously, I am not trying them personally. My fish don't seem overly crazy about them. But that can be because they are not used to it. I was just disappointed in the packaging. It arrived in a ziplocked bag, pretty much with foreign writing on it. I can't really read the directions or any kind of literature about it, although none came with it anyway. I just thought it looked more like dry cat food packaged at home than a professionally packaged item.