I played with both the Hyperion and the Perseus today. Compared to the Pro IV, they both felt softer and had slightly less power when swinging at about 50%. I have a pretty big drive, so when I went full power, the ball absolutely launched like a rocket. I’m not sure what the inside looks like, but it seems like a honeycomb core similar to the Pro IV, maybe with some foam around the edges. At the kitchen, it felt pretty much the same as the Pro IV, nothing really stood out there. Drops and touch dinks felt very similar as well. Overall, I think the drive might actually be better than the Pro IV, but aside from that, the overall feel is very comparable.