I have a cut down main for my tornado with a wire halyard extension. I have only used it a couple of times in winds above 20 knots. It works well as far as having an under-powered sail, but the downhaul wasn't that effective. I tend not to go out in that much wind, so it was more of an experiment than something to actually race with. I had wanted to be able to go out in heavier winds without worrying about sailing on the edge of control 100% of the time. So if it is blowing above 25 knots, the boat stays ashore now.