Peacock are meant for children really as the lack of a full metal loop makes them not so ideal for weight carrying. However I don't know if this is more of a traditional thing as I see loads of adults with them now. I personally would never use them, even though I'm around 10st. I always use bent leg irons, never had a problem. Those people who have had probs with them tend to have had poor footware or position of their foot in the stirrup. I've never been caught up in them, even when my last horse bronced for around 20 yards, then finished it with a rear and spin!