I have an OE. Mine in particular isn't really friendly and she sometimes harasses her flock mates. She never causes any damage though. She is around 7-8 months old and I haven't gotten any eggs yet. You asked if they were a friendly "breed" and I wanted to clarify that reallt they aren't a breed at all. They are simply a cross between a dark brown layer and a blue layer to get a dark green egg. There can be several looks and personalities to them depending on breeds used in creating your OE. Mine is a marans (dark layer) x Ameraucana (blue layer). Often times you'll see F1 or F2 accompanying the birds description and that indicates whether the bird is a first generation OE (F1) or second generation OE (F2). Typically better olive colored eggs are expected with F2. Besides marans and Ameraucana, I've heard of people using welsummers, crested legbars, & icebars to get OE. Good luck with yours. Hope she works out well for you!