After years of avoiding polys due to fear of arm issues, I finally tired Topspin CyberFlash based on rave reviews here. Next I created a hybrid of CyberPower mains and CF crosses. Nirvana! All of sudden I could generate massive topspin, control was improved 300% and all of a sudden I no longer had to worry about swinging hard for power as smooth strokes rewarded me with power and control. A flat ball hitter with long strokes trained on wood, I suddenly found myself entering the 21st century without really changing my game that much. What are the technical characteristics of these new co-polys that allow them to quickly transform a classic game like mine into a more modern, spin oriented style? They are supposedly stiff, yet they seem to pocket the ball and allow a player to hold the ball and guide it with minimal effort. Comfort is essentially the same as most syn guts. Inquiring minds want to know.