The best way I can describe the Dynaspot is to compare it to the Wilson Hammer or Power Weight system rackets except the extra weight is only there on contact. I know that sounds unusual but when you are not swinging the fluid settles to the bottom of the head and the racket feels almost head light; this quality makes getting racket head speed much easier than a typical head heavy racket. Because you can generate good racket head speed and still get the benefit of head heavy mass at contact you can really generate great power but you still have good control. On the down-side, because the fluid (extra weight) moves toward the head of the racket on contact and through the stroke it's more difficult to get the necessary wrist snap at contact that produces the exaggerated topspin that is so popular in the modern game. In my view the Dynaspot fluid transfer technology certainly provides an advantage in power generation over a traditional racket and I understand why it's illegal. Kind of like spaghetti stringing - it works!