Had formula wings on my Hobie 18. They are great for rec sailing especially with kids. They absolutely suck for racing in any waves. The leward supports dig in on every wave and if you accidently get up too high, the wing itself will dig in and spin you to leward (powering up). If you go over, plan on a long swim as they resist righting the boat like a big 5 foot skeg keel. If you get them, make sure you can easily remove them while racing distance. I do think they are worth the effort and money for fun rec sailing.