I have played with both of these racquets off and on over the past year and a half. The specs of the two are almost identical, yet at times they seemed like completely different racquets. How is this possible? I've never tried them side by side with the same string set-up, so I'm coming to the conculsion that it must be the strings that are making them feel and play differently. But maybe not - IDK. Is there REALLY a big difference in the two frames (besides the obvious throat design)? Maybe weight distribution? Or do most people feel there is very little noticeable difference? Thanks.