Last summer I played in an outing at a Country Club and it was 'Titliest Day'.....they had a golf ball tent display set up with an 'expert' from the company to answer questions........we were 'told' by Titiest that there was "a maximum distance difference off the driver of only 3 yards from their 'longest ball' to their 'shortest & softest' ball". According to the rep from Titliest, almost all of the differnce is spin into the greens and feel with the putter, and that performance off the driver was nearly identical throughout their product line.
I have been using the yellow Srixon Z-Star this summer and love the color and the performance.