The technology is constantly improving, therefore the rackets are getting better and better. Also if your racket is few years old it might have lost its elasticity and power. When you are trying a racquet make sure you do not completely rely on demo, since most likely it will come with some cheap string that might be strung at the wrong tension. You might want to restring demo racquet with your own string, which might get to expensive. My advice is not to change specifications to much (stiffness, weight, swing-weight, string pattern, etc). The following few points will describe what each specification actually means.
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