Hummingbird Feeders provide a source of sugar water for these tiny birds to refuel their incredibly fast metabolism. In my opinion the keys to a great hummingbird feeder are:
1) Is it easy to clean?
2) Is it easy for the birds to use?
3) Is it vulnerable to leaking?
4) Does it have a good warranty?
Remember, the hummingbird nectar ratio is 4 parts water to 1 part sugar. The North American Hummingbird Society warns against using anything stronger than that because it requires the birds to seek out more water to help break down the sugar.