Potential Shaft Change

I currently play the 710 MB irons with TT Dynamic Gold S400 shafts which I was fitted with at a Titleist demo day. I recently won a set of TT Progressive (Pro)S300 shafts. I am contemplating switching out shafts in my irons. Is anyone on Team Titleist using this new shaft from True Temper?

This is a great shaft!  The flight is controlled through the set by utilizing stepping patterns that are progressively adjusted in length to alter the tip stiffness as you move from the long irons (softer tip for higher launch) to the short irons (stiffer tip for flatter trajectory).  The long irons are the least tip stiff of the DG Pros. This is to encourage a higher trajectory, since most golfers struggle to launch these clubs as high as they do the shorter and higher lofted clubs. Additionally, the higher launch should lead to more overall carry and less rollout than standard setups.  The intention of this section of the DG Pros is to provide a higher trajectory and they really do accomplish this thanks to the progressive tip stiffness.   The most impressive part to the higher trajectory is being able to hold greens with a 3-5 iron ... what a lot of amateurs strive for.  The short irons of the DG Pros are the most tip stiff of the iron shafts thanks to the larger steps they possess leading into the even shorter tip sections. The stiffer tips are intended to provide a slightly flatter trajectory than typically seen in the scoring irons to prevent ballooning. You can truly feel the shaft unload and kick through the zone.

I am thinking of putting them in my AP2 714's.  

Chris, Thanks for the input, a similar story to what I received from my local club fitter. If I swap them out I will post the results here.