The birds love this hummingbird feeder, but, I did see a bee wiggle itself into the little port and then got itself out again. This will keep larger bees and wasps out, but, smaller ones can get inside. One reason I got this is because there is no yellow on it, the color that attracts bees. I'm amazed so many feeders have yellow on them, especially, where the ports are. So, I recommend this feeder...it's very easy to keep a hold onto it when cleaning it.
I have several. Only problem is the metal part rusts over time and needs replacement.. also gasket needs to be replaced occasionally.