I worry about her, the duck, but I think she thinks she is a chicken. We started with two but one was attacked and lost. They were brooded with the chickens and imprinted on them, so everyone just happily flocks together. I am thinking I may try to get more ducklings next year, see what happens.
Yes I am happy with my mixed flock, I started with just the BRs had a dog attack and the owner kindly gave me two EE in return for the lost birds. Then I added the others. I enjoy the BR personality, they make great foragers. The large assortment of meat birds are a new experiment. Before I just had a few CX.
And yes I think the EE make great watch birds, they are as good as the Rooster was.
I happen to really like the outgoing curiosity of Dominiques from which BRs were bred -- except BRs were crossed with Malay and Indian Game to make them heavier/meatier -- so it's not surprising the BRs have congeniality in common with Doms. So sorry about the dog attack. That sucks! I almost lost my first flock to stray mutts that broke into the yard through an old gate but good neighbors chased them off before they got to our birds.
Outgoing curiosity is a great way to describe BR. They are very good little hunters and very quiet, makes the EEs useful. The EEs stay with the BR hunting but are the first to sound alarm. The other breeds are still young so I do not yet know their personalities.