I hate them, they are evil
We had one (briefly) and he was demonic, the chicks loved him, preening all day and following him around, until he started getting jiggy with it, he took clumps of feathers out and some of them were quite scared of him, as were myself and the kids. needless to say he is no longer with us
there was a sigh of relief all round when he was gone, so I would say if you want one get one but you don't really need one, I have 40+ hens and they manage fine without