Hmmm, well I have been fortunate to have 12 sets behind the 5.3. 6 of those in tournaments, 3 sites, 2 different boats. I had several 4.5@35 and several 2@38, stock scores for me of which I have way too many. So no impact on my scores at all, I actually liked the pull. EXACTLY the same as a 5.7 or 6.0? No, but very very similar to me, sorta slots right in between. I run the same setting. Going from Nautique to MC to Malibu all seem like much bigger changes (CP and Nautique are similar to me). I won't complain about any of them as they are so good and so close the driver seems to be a bigger deal than which boat. My direct experience, not what I have "heard". At the 3 tournaments I was at didn't hear anyone complaining, at least not about the boat...
Haven't skied Darin M's boat yet but it's just down the lake. Maybe I can get ride from him, just for testing purposes of course.