I got some Guineas two years ago. Most adorable chicks I've ever seen. Raised them in the house and handled them a lot, just like with my other birds. Five acres of land, yet they never went more than thirty feet from my house. They flew up onto the roof all day, tried to lay eggs up there (once one fell right onto my head, just like in a cartoon), pooped right in front of my door, screamed all day, and attacked people. I don't just mean unfamiliar people too, they attacked everyone, even me. Needless to say, I'm not a fan.
Although, they do lay delicious eggs and they are very good guard birds. And they have very pretty feathers, good for crafts. I think I just got a bad batch, because a lot of people I've talked to love their Guineas. They're still only semi-domesticated, some lines more than others, so make sure they come from a good, non-aggressive line.