I'm still looking for THE replacement racquet for my Wilson Ultra FPK and I had a revelation. With my current racquets being fairly old (in play for about 5-6 years and starting to get banged up), how much stiffness has the racquet lost? The SI was originally 5.0 which I believe was fairly stiff. But with the tapered beam, it has a unique feel. Was wondering if I've been looking in the wrong places for a replacement. Could the stiffness be in the 6.0 or 6.0+ range now? I love the way the racquet volleys, and with some of the new excitement about the ROK, I'm thinking about giving that a try. I've hesitated trying the ROK because of the lower stiffness and the denser string pattern. Slazenger also has their new Pro X1 coming out in early April. It has a thinner beam (20mm), lower stiffness (64), and is 11.5 OZ with what they say even balance. I'm going to try that one out for sure. Looks like they are going for the players racquet at the other end of the spectrum (after the previous Pro Braided models being so stiff). Back to the original question, how much stiffness could a racquet lose?