Pros - Naturally disease resistant, feed to egg ratio is the best by far.
Cons - None
I have raised this breed for 14 years, They are the best dual purpose bird in my opinion hands down. And I have tried many breeds.
They free range, withstand confinement without a problem, lay 300+ very large eggs per year, 50% of the feathers means they eat less and more goes to their egg production. They are the only known chicken to be naturally resistant to most diseases, so much so that in other Countries around the world Naked Neck's are introduced into the flocks to make them stronger. (think about that the next time you buy some imports )
I live in Texas and they withstand our 115 degree days, and survive when Mother Nature pulls a fast one on us and it is below freezing. Usually in the same week.
Pros - Very tolerant to both heat and cold. Calm and friendly, often to the point of being dog-like. Eggs are Lg to Ex/Lg and in various shades of brown.
Cons - None to speak of...The cons are in the minds of some who see them for the first time.
My family has bred these birds for more than 70 years along with Australorps. We have recently decided to cut our work load and the breed we dispersed was Australorps, another one of the great production breeds.
The initial 'Jurassic Park' look of this old breed does indeed make some people skeptical that they are chickens at all but once you get to know the breed, realize what wonderful personalities and production qualities they are endowed with, it's very easy to fall in love with them. Many are dog-like in as much as they will follow you around and try to 'help' with whatever project is at hand. That being said, it would only follow that they make excellent pets for children...of all ages. Additionally they are above average brooders and take the job of motherhood very seriously. Some will group-brood, with as many as three hens caring for the chicks as if every chick was their own...then some are very territorial and guard their chicks against adult birds, other animals and humans they do not know.
Am I prejudice? Absolutely, but my views are based upon a lifetime of raising this breed and if they weren't all I say, they would have gone down the pike many years ago.