My hummingbirds give this a great review. They love it. There is one small drawback in that it's hard to clean. The opening of the mouth is small on the glass jar so you can't get inside to clean it and the plastic base doesn't come apart so I had to get some pipe cleaners to clean the inside as it can get moldy in hard to reach spaces. Overall though the birds love this glass one as opposed to the plastic ones I have.