I think it's unwise to draw quick conclusions about the power levels when comparing rackets just from demos. Reasons ? The rackets are strung at different tensions from each other, have different strings, and varying amounts of string wear. For a more accurate test, the rackets would have to be strung at the same tension, using the same string, at the same time. Just a 7lb drop in tension can mean the difference between a racket which has almost no power to one with decent power. I had one experience with the RDTi70 long (18x20) which felt it had no power at first (57lbs), but felt like at rifle at 48lbs.