I might be able to let you know in a few weeks, as I have duck eggs in the bator right now. I had some temp problems (104F!!!) and I'm worried they might already be cooked, but if not I shall let you know how it goes with them. I was wondering a bit about the imprinting thing already, cause I'm just incubating these eggs for a friend, and any/all ducklings will be returned to him a few days after they fluff up and start running around. I was worried they might imprint on me, then miss me when I give them back.
A book I've got about geese actually says you should be careful not to let goslings imprint on you too strongly, cause obviously you can't be with them 24/7 and they will just get quite agitated and upset when you're not around to look after them. It's better if they just imprint on their hatch buddies apparently...