I currently have 5, adding #6 in 3 weeks.....I started with 5 chicks, three 3 weel old GLW's, one 3 week old EE and one 5 week old Salmon Faverolle, all girls. The guy I got them from has mostly heritage breeds (what I really wanted to get) and was willing to exchange any chicks that turned out to be roos. I can not have a roo where I live. All turned out to be sexed correctly and they got along fine. The SF was the leader. I lost the SF at age 6 months and then added one RIR and one BR both 5 weeks old. By then one of the GLW's was 'boss'. I kept the new chickens quarantined for 30 days and then put them in the coop but still seperated with a wire fence. After a couple of weeks of the 'getting to know each other' I let them roam in the yard and coop with supervision. They were almost the same size as the original group by then. There was some posturing and mild pecking, the RIR was pecked on a bit more though. Turned out to be a boy and I rehomed him when he was 17 weeks old and trying to crow. The remaining 5 are getting along fine, the GLW is still 'boss'. All the girls are about the same size (the EE is slightly smaller) and I think that helps. I will add a 10 month old Wheaten Marans to the flock soon after quarantine and slow intro....
I love my GLW's, they are beautiful and follow me around, my EE is a bit more shy but I can pet her and pick her up when I need to check her and the BR is also friendly. I have to say the SF was my favorite, she was very sweet and friendly. The Wheaten Marans I have coming is a beautiful girl too and lays beautiful dark brown eggs - don't know yet how she is as far as temperament. She seemed pretty inquisitive