Ducks are great. I think your ducks would be fine with a set-up similar to your chickens, as long as they also have bathing water (a small kiddie pool works fine for this). I'm assuming you are planning to get more than one--one would be terribly lonely and confused, and probably begin to think it was a chicken, but the chickens would know better and probably pick on it. So get at least two. And ducks in general are quieter than chickens, so no worries there--as long as you don't get a call duck or something notoriously loud like that.
There are down sides. Here is what I can think of:
They are very, very messy, even compared with chickens. Their poop is wet and they walk all over it with webbed feet, smashing it into the bedding. Because they drink so much, they poop more than chickens too. You will have to change their water every couple days and probably the bedding too (I use a deep litter method and only change the bedding once a year--the rest of the time, I just sprinkle fresh straw on top of the old, but I have to do that every day to keep their pen in good condition).
They like to "roost" on the ground, so they are more prone to predation from foxes and raccoons and such. They also are not as predictable about going into their house at night, so it is harder to shut them in--it can be done, it's just more work.
They are often not as consistent about laying their eggs in a nest. Mine tend to lay them either randomly around the pen (where they get pooped on), or in a ground nest hole that is dug so deeply into the ground that it is muddy. The eggs, therefore, are generally very dirty and require washing before use.
Hmmm... That's all I can think of. On the up side, the eggs are larger and more nutritious, ducks are quieter and gentler, they are cuter (in my humble opinion), they tend to be hardier, and they're very, very fun to watch. Also, they are more resistant to cold, and need very little shelter from the elements, but MUST be sheltered thoroughly from predators.
Good luck either way!