Anybody used these? What do you think.

They use lift, like 3 mini aeroplane wings to spin the shaft, not drag. They have silent flight as well. And, they are fletched straight, and have no kicker like a quickspin. Aparrently they will spin the arrow more intensly than a quickspin with no drag. They are also stiff, so as not to distort at high speeds. Arrow trajectory is flatter too. @ 40yds, my FMJ's jumped an unbelievable 17" up, while @ 10 yds they were only 1.5" high. My pins are half as far apart, and the arrow weight is the same. Sounds like a plus for 3-D. Also, my 60yd groups went from 8" to 4.5". I like them a lot.