I love my Guineas. They eat out of my hands, but don't want to be touched of picked up. They let my chickens know if they feel indangered and my little silkie thinks she is a Guinea, as she prefers them to my rooster. My rooster has tried to mate with them, but never yet the other way around. They are pretty attached to me as they follow me around the yard calling after me, "come back, come back, come back lol, thats the female, I still don't know what the males are saying lol. Mine have been around us a lot and really aren't noisy, and i enjoy hearing them. They are a wild game bird but I truly enjoy having them and they get along great with my other chickens. I know they are supposed to be fed higher protein feed, but mine get quite a bit of free range and i just feed chicken feed and some scratch.
As far as being bullies, if you could see my 7 wk old Buff Silke cockrel you would die laughing, cause my Guines avoid him, they step aside because he stands up to them even though they are 10 times bigger. I would say go for it.