I've had these for years. Brief rundown:
Quiet - if they quack, something is wrong, or being attacked (maybe just by an amorous male)
Fly - but they fly around, not away.
Meat - Red meat similar to veal. Males can give a good 15 lbs or so. Great for people affected by alpha-gal tick disease.
Good moms - moms can sometimes raise 3 clutches a year, meaning 45 or so babies!
Talons - these things can cut you open like a velociraptor, so the way to get them is push them down, keep those massive claws on the ground...!
Feed - Don't need much to supplement. I usually throw out some corn just to keep them friendly. Otherwise they forage well.
As always, keep a dog around that will protect them, otherwise coons, foxes and whatever else will take them out. Snakes WILL eat ducklings. Kill every rat snake (black snake) you see. They are worthless anyway.