I can definatley tell you that my experience with Buff Orpingtons has NOT, i repeat NOT been favorable. The two of them i had, while both still alive were skittish, and the roo turned out extremely aggresive. Here are my other breeds i can tell you of;
RIR - One, Mocha is the SWEETEST bird. She talks, and talks, and talks, though. She will cuddle, but is slightly
afraid now that a kid got aholts of her

But the other, Java, is one of the most evil chickens ive
ever had! Aggressive, skittish,....just evil in general.
Sex-link - She is a good girl. Not really sweet, but will come right up and socialize. She is alittle more skittish
than the others, but she doesnt talk at all, just on the rare occasions. Isnt aggressive at all.
Australorp - She is so sweet! She talks, CONSTANTLY. Shes very curious, niping, not biting! - at your cloths, and is so soft. She is still skittish because she was raised for money and sitting, not for pet life, but she has come around SO, SO much. A beautiful, personable bird.
Wyandotte - My GLW, Rama, is such a sweetheart. Shes the lowest on the pecking order, besides the cockerels, but is a sweetie. Shes skittish, but i honestly think if she had had hands on interaction as a chick, she would love on you and never stop. But, she was raised with the others i got from some lovely amish folk, which means no "lovey dovey" on chicks.
My SLW, Seta, is a different case altogether - just like the RIRs. Seta is evil. Like java, she wont come around me or anyone else; if you get to close she pecks you; and generally makes a fuss of everything. On top of that, shes very aggressive with my other chickens.
Oh, and they dont talk - only once in a blue moon!
Rock - I have one barred rock, and she is very calm most of the time. Although, she isnt personable - rather bland, actually. She is just.....there. I couldnt even give her a good name
Altough, she doesnt talk at all, but is periodically aggressive.
Morans - I have a Cuckoo morans cockerel, and he is the SWEETEST most PERSONABLE boy ive EVER seen in my life. He is So, SO SO SO SO calm! Just so placid, but not bland at all. Very sweet - he just comes right up, and get so close to you. Always submissive, NEVER aggressive. Like my australorp tau'i, he will peck at your clothes, and is completely trusting. He actually enjoys being loved on quite thoroughly. Growing a big nice comb/wattles to boot! Just a great boy all around.
*He does talk a bit - mostly just crowing though. I dont know about hens, but they should be fairly quiet I would suppose!
Hope this helps someway!