This is just my experience: I have 6 BPR that will be a year old the first week of April. Of the 4 breeds (BPR, EE, BA, CW) I have, they are the most dependable layers and laid well all winter.
They are at the top of the pecking order in my flock of 27 pullets and 2 cockerels. They are definitely the bravest of my girls and are the first to explore new areas of my property and free-range the farthest. They are all very friendly with me.
On the down-side, they pick on my EE's and my older roo. They were cooped up a lot of the winter and started feather plucking some of the others. In my experience, they are the most aggressive.
Great breed, fabulous layers, friendly, but not a pushover in the flock so they may come off as bossy. They don't usually go broody, but there are exceptions. They're my favorite breed. I have barreds, blues and one black Rock.
Thanks. I'm looking forward to seeing how they fit in. So far, the six seem to be getting along well. I really haven't had a problem mixing in the past; I've noticed my grown EE gets picked on since her sister was killed by a skunk. I was so upset since she was the most personable of all of my girsl. The only bird I've had a problems with was a Red Sex Link Roo. He was absolutely magnificent, but was such an agressive mater (and I know that is how it's done); I just couldn't stand seeing my girls backs always raw. Had to find him a new home.