I have had these trays for my parakeets a little over a month and they saved SO much time and money because there was little to no waste of seeds, little to no vacuuming. I LOVED IT!!! I was about to order a few more when I decided to add a mixture of feed that my birds don't care for as much ( because I was running low on the kind they prefer and to get rid of the expensive more natural stuff without wasting it). As it turns out, the only thing this did was teach my parakeets to somehow get the seed completely out of the dish. Even after switching back to only their favorite seed, they have continued to somehow still get almost all of the feed, good and bad, at the bottom of the cage and on the floor. So I am back to square one. I am very disappointed. The 4 stars arr literally because I love this product, the one star is because my parakeets apparently hate it.