Not a one
We had one for years on our 34. Never found a good way to secure it to the split backstay. One day, up in Desolation Sound, BC, it FELL off of the boat in a blow. That was an eye opener. It layed flat on it's side. Never did come up. We recovered it but never forgot its' poor performance. (made by Forespar) But we still kept that thing until we reached Antigua. Then it went in the trash. Be sure and test yours.