Carl and Hakan,
I can understand the benefit of center sheeting on a sloop rig where the crew is usually handling the mainsheet. But I cannot understand the benefit as well on a singlehander (or on a sloop rig where the helmsman handles the mainsheet).

With rear sheeting, if the helmsman is holding the sheet, it helps to stabilize him when he is on the trapeze and keep him from being thrown forward. Doesn't he lose this benefit with center sheeting?