I have seen a couple of Hummingbirds fighting over the bee balm but not using the feeder yet.
Here is a link that might be useful: Hummingbird video
Here is some more Hummingbird video in slow motion.
Here is a link that might be useful: Hummingbird in slow motion video
How delightful! They use both Jacob Cline and Raspberry Wine in my garden. Go figure!!!!