Got four rounds with the new 913 in and I feel it is time to share my opinion on it.
Mine is a 913 D3 8.5* with a Motore Speeder VC 7.2 Tour Spec X.
At address, like all Titleist clubs, it looks great. I could only see very minor tweaks in this department. Flatter crown, slightly lighter paint, sits beautifully behind the ball, it just wants to be hit FAR.
The head and shaft combo definitely knocked my spin down from the 910 I used to game (910 D3 8.5 Kiyoshi 75X or a Accra Tour Z 75 X). The lower spinning setup makes the wind almost obsolete, unless I am hitting dead into it. Also on mishits the ball will definitely go...hard, especially of the toe. Hit some bombs that were just slightly off the toe.
All in all I am impressed with the stick and look forward to playing it when it is more then 45 degrees out!