Pros: broodiest, tame, smart, rare, cool looking,
Cons: Most often has to be kept in pairs, poor layers, slow to mature
I am new to these and only have a pair at the moment. But they are very tame, let me pick them up and eat out of my hand with no "training". Very broody, among the best, better than silkies. Not at all people aggressive, but should idealy be kept in pairs. Have been integrated into non-gamefowl flocks when young and preferably free-ranging, no other cocks. Intelligent. And good rangers. Poor layers. and slow to mature.
If you raise chickens for the joy of it and for reasons other than just eggs and meat than these are great.