I added to my flock of chickens this spring several Muscovy ducks, a pair of pilgrim geese, and three arficans. I enjoy them, with the exception of my pilgrim gander has a bad attitude. He attacks everyone, not just strangers.
My advice would be get them but don't be afraid to cull (or eat) any bad ones. Also, be aware they have negatives which include:
Africans are very vocal, of course if you live in the country it may not bother you (it doesn't me). I have read that many breeds of goose, the males get very aggressive defending their females when sexually mature, and almost all do the same when they have babies. Geese may not be appropriate around small children. I have a 2 year old which must be very closely supervised and protected from the pilgrim gander.