I agree with AGeese, there is that possibility of a gander trying to mate with the hens. If you do get a goose, you will need to keep a close eye on him once he hits about 4-10mos. If he tries to grab the girls, you'll need to firmly let him know that's not allowed. We usually move him away from the girl and grab his beak firmly while saying "No Gussy. That's not allowed" Sounds silly, but it works. Geese have pretty good memory and will hold grudges

my mom, despite being the "mama goose" to our big boy got on his bad side once... took them a while to reconcile
As for any other geese, I'm not planning on having another for quite a while- we don't have much space for 2, not to mention a goose friend for Gussy may cause him to turn on the hens. Geese can live up to 20yrs, so we have some time yet. If I do get another in the future, it'd rither be another African or possibly a Chinese