Pros: hens are calm, docile, w/ decent production.
Cons: Males unpredictable. Hens never went broody.
My experience with Buff Orpingtons was a mixed bag. The hens were very calm, quiet at laying time, and did a decent job hustling their own feed (free range). Being so docile does make them low on the pecking order, and they are very receptive to repeated breedings, so they end up with bald backs (rooster to hen ratio was 3:35). Their production was average in the flock, with the black stars, barred rocks, and rhode island reds out-laying them, and the BS and BR's producing larger eggs.
The primary reason we added the BO's to the flock was to get natural, broody hens who would hatch eggs for us, and it was a bonus that the breed is known for its good temperament. We were disappointed to see that in 3 years, none of the 12 hens went broody even once...they had no interest in hatching any eggs. And two of the cockerels we kept back as relacements were unpredictable as to temperament. One we had to cull when he took to launching sneak attacks on any men on the place. Overall, the BO's just could not justify a place in my homestead flock. We had far better production, as well as the most broody hens, from our black star girls, with the black australorp a close runner up.