I've been playing with Tour SD balls for the last couple of weeks because I'm running low on credits. When I first bought the RocketBladez irons, I had to switch to Srixon or Callaway balls because the meter was so fast. Now? No feel and I'm still dinging it just as much as with the high end balls.
I even wondered a couple of days ago if I'd accidentally switched to the good balls, because the meter felt so slow. But no, apparently I'd just gotten used to the meter speed.