I've found most responsed interesting considering my experience with the pentas have been exactly opposite. I recently bought 3 dozen pentas because of the special they where running buy 2 get one free. I've found that the penta for me spins way more than the pro-v1. As a matter of fact I'm wondering if anyone else has seen what I have seen. With my driver its just as long as the pro-v1 but as the clubs get more lofted I gradually lose more and more distance to where when I get to the wedges I'm almost a club and a half shorter than usual. Maybe something has change in my swing but when it gets warm enough I'm going to go play the pro-v1 side by side with the pentas just to make sure.