Pros: Great layers, fearless
We added 3 Barred Plymouth Rocks to our existing flock this year. We handeled them a ton as chicks to get them used to humans. We also go 3 Buff Orpingtons with them and raised them together. The buffs integrated into the flock without any problems. The Barred Rocks not so much. They attacked, pecked and defethered all the chickens except one EE. When they started on her, she let them have it. She's not the queen of the flock but she doesn't want to be bothered either. The Barred Rocks also imprinted on my husband to the point that we started calling them Dad's Girlfirend (DG). They would follow him around the yard and peck or chase anyone who came up to him.
We'll be getting new babies again this year but it won't be Barred Rocks and we'll be getting rid of the Rocks when the new chickes are old enough.
They do lay very well though and they seem to be able to handle the cold and heat very well. They're just not for me.