Haven't used it, but in their description they caution that it could result in mast step/hull damage, so be careful doing the super vang in a moderate wind!
I have a Rooster 8.1 for the past two years. It is fun to sail when there is a very light breeze. If the wind gets above 10 mph I'm over powered and need my standard sail. I weigh about 195 and 6 ft.
Have no fear. I've been sailing one of the Hansen Turbo sails 125 sq/ft(full is 76sq/ft) for most of the summer. I've taken it out in gusts over 20 knots and everything is fine. I did pickup a Cspar carbon upper. I'm in AU so they are about $400. I've got it rigged on a single block fixed bridle. It sails way better than a regular Laser. It is a bit more work up wind because of the extra righting moment. The reaches are amazing.
The Intensity sail is a bargain. It's just missing the full battens.
Does anyone have one of these Intensity Powerhead Sails - in decent condition - that they would like to sell? Mine is now seven years old and getting beat. I use it often when Tomales Bay winds are too light for the standard. In light to medium air I think this is a brilliant sail.