Take your boxster above about 130 mph and you will really notice the difference with PASM , the car becomes more planted and feels much tighter in steering response. If you are not running on 19" wheels or live in an area with perfect roads and no plans to go on track , then you probably wont see the benefit of PASM. Of course if you get PASM with the sportchrono packet plus you also get a sharper throttle response too. I have both functions but rarely use the PASM in sport mode on UK roads as the surface is so poor. I am thankful for having it though as I have the optional 19" sport techno alloys.