I LOVED my calls, not really noisy apart from the odd 'chatter' or at feed time, or alarmed by something, always waiting by the shed for their supper, whites with their bright orange beaks looked smart, and I had some Apricots, my favourites were the brown and white ones, my 'Gypsy' line :-). loved to watch them 'hoovering' across the lawn, didn't harm any plants, kept small slugs down but couldn't deal with the big ones (lost 2 with big slugs stuck in their throats). drove me crazy when I was digging the veg patch and one would dive under the spade for a grub or worm - a few near decapitations there! they only have small beaks so don't do anywhere near as much damage as bigger ducks, I liked them to have slightly bigger beaks than the show ducks.
I lost some once, about a week later they actualy came home! I think a local farmer had them but they flew home. (they can fly, need a wing clipping till they are settled, mine would fly in a circle above then land.
sadly they were a target for stoats, and mink, final straw was a wipe out by fox, one left alive and a dying drake. couldn't bear to keep losing them like that.
If they are kept in a run they should be fine,
a pair or a trio would be best. I think males (brothers?) would be OK as long as there are no females to fight over.
they only lay eggs in spring
I still miss mine, but goats have filled the gap.