Welcome to BYC Mike!
I own some guineas, they're trouble makers, feather pullers, and fly wherever they wish. But, they are good for predator alerts, they CAN be good mothers, They lay eggs, they are hardier than chickens. Though, you need quite a few for a happy flock, my male right now is pulling at my chickens feathers, so keeping them separate from any future flocks or present flocks is best. Good luck on the guineas!