Yes, the answer is most simply stated, 'Test them both.'  However, if the previous model Pro V1x fits your game best, my guess would be that the new model Pro V1x would be your preference.  Think about it this way, as time goes on, Titelist does…

Marc,

To quote Mike DePaolo,

"The cover of the Pro V1 and Pro V1x features Urethane, a soft material that transmits a softer sensation to the hands and provide more scoring spin than Surlyn-covered golf ball models. The Pro V1 and Pro V1x are designed…

See below, as it is from the description on the Titleist shaft chart.

Mitsubishi Diamana +Plus Series shafts combine the premium materials of Original Diamana with the MDI technology of Gen2 Diamana to deliver the great feel of Original and the stability…

There may be a conventional star wrench that will fit the bit, but the handle is also a torque wrench to cinch the screw to the proper amount.  They can be ordered if no other source exists through an authorized dealer. 

Shawn,

Looks like the GD DI 85 and 105 are available for 913H.  DI 6/7/8 for 913 fairway options.

Hi Lewis

I play my golf at The Island in Dublin a very tough links and I must say I got the sm4 last year and love them great control and spin especially on half and 3/4 hit shots holding into the wind etc.

Regards

Colin

Hey Mike. when you see me at the course next time ask me for my three wood. i just ordered a 13.5 with a speeder 8.2VC tour spec. basically a fairway wood shaft of the 7.2 you sold me. and i should have a new 5 wood in a week or two i put a v2 shaft in…