We've had quite a few roosters over the time we've had chickens. We've had a bunch we did have to get rid of- whether they were aggressive to people, or the chicks, or just had really poor genetics. But we've also had a couple great roosters- including our current Legbar X roo, Ketchup. Whether you should keep them or not is a matter of personal choice, and the bird in question. But we've found that keeping a calm rooster can help keep a calm flock. Sometimes they'll even break up squabbles between the hens. Also, you can still eat the eggs. As for them causing grief for the hens, again, it depends on the bird. When Ketchup was younger, he did have a 'favourite' hen who he'd harass a bit too often, but as he's grown up, he's calmed down even more. Most of our other roosters we've had, we never had a problem with. Once there was a bit of a problem where a young roo was harassing and attacking a particular pullet constantly, but that's not something we've had to deal with often. I would keep an eye on your cockerel, because most of the issues we've had with ours occurred when they were a little bit older, but you probably won't run into any issues. From what I've read, Orpingtons are usually pretty docile.