I don't have one yet, but you need to make sure you get a HEPA filtering one, not an ionising one. Something about what the ionising ones produce or remove from the air, isnt good for birds. Some you can turn the ioniser off on - if you keep it truned off then they're fine.
I have a really old HEPA one... it's from when we had our Moluccan, so... 6 years old? :rofl: Still works great, REALLY makes a difference on Moose and Goober's feather mess! I have to take the filter outside once a week, or it gets clogged I don't know the model or where you could get one like it, but it's made by Holmes :thumbsup: