I hit the new driver today on a launch monitor.  I hit a 10.5 head with a Diamana blue regular shaft.  Hit it pretty well with about 225 yds of carry about 250 - 260 including roll.  My club head speed with the driver was between 96 and 99mph.  The store didn't have stiff Diamana blue shaft.  I hit the Aldila RIP 60 stiff and didn't hit it quite as well.  I'm 52 years old and have always hit a stiff shaft.  Although I was happy with the flight and the way the club felt with the regular shaft, according to the Mitsubishi web site, my club head speed would be more fitting for a stiff shaft.  What do you think?  I want to order a new club, but am stuck between a stiff and regular.  Thanks