Pros: Fantastic layers, docile and sweet if socialized well, will defend themselves, great for controlling pests such as ants and flies, good foragers
Cons: somewhat noisy, a bit of an attitude (will bite the crap out of you if you piss them off or scare them)
Our first flock was three delawares and we loved them. We kept them inside in a large action-packer initially until they were big enough to go into the back yard. We handled them a lot when they were little so that they would be friendly and they turned out to be sweet and affectionate hens that loved to come sit in your lap. For a while we were afraid of them being eaten by a cat, but then I watched one day through the window as our largest hen charged a huge feral cat head on. The cat was too stunned by its prey's audacity to move at first and consequently suffered a sound clawing to the face by said chicken before taking off. I went out to check the hen, Martie, and found her huffing and puffing around the yard with bloody claws like a bull that had gored a matador. I was impressed. Martie, Natalie, and Emily (we named them after the Dixie Chicks) were never bothered by cats as long as we had them because they would just run them off whenever they showed up. Before we had chickens we had a horrible ant and fly problem, but the chickens nearly eliminated them once they were put out. If I found an ant hill I would just call them over (yes they knew and answered to their names) and they would destroy the whole colony in an hour and then dust bathe in the hole where the colony had been. They were also GREAT layers, giving us an egg a day, sometimes two, and only stopping for a few days when the weather changed drastically. They only things we didn't like was that they were a bit noisy, and that they could have an attitude sometimes. As far as chickens go they were hard core, they didn't take crap off of anybody. If a kid came over to visit my sisters and messed with them, their nest area, or their food/water they would bite their fingers and legs until the kid ran inside. But if the kids were well behaved they would gladly allow them to pet them and hold them. I used to clip their wing feathers so they couldn't fly over the fence, they'd let me do it without struggle but once I put them down they would bite me on the leg, hard, before going off to sulk for a while. Needless to say, they were an interesting bunch.