Oh, and... As far as loud, it depends on your variation of loud. I'm very used to budgie singing, who are the loudest, since I spent numerous years in college around screeching redtails.
Hummer, It depends on the bird. My conure keeps all of her food in her cage, so it's the occasional feather that falls out. Very clean. The tiels on the other hand, when they molt, it's feathers EVERYWHERE. The budgies can occasionally get seed outside of their cage if the food bowls are towards the side, which mine are not