I currently have both types of shaft in my playing sets.
The rifles(5.0) are in my SMT irons and the DGs(R300) are in my blades.
Overall I prefer the Dynamic Golds as I have a high ball flight and they keep it down a bit.
That said ,the rifles are a quality shaft.
I'm not that keen on sensicore but if you want vibration dampening this can be added to any of the shafts very easily with these inserts from MyOstrichGolf
http://www.myostrichgolf.com/clubmak...roducts_id=613
I will be changing my rilfes for Dynamic Golds next season as they are my favoured shaft.
Have you considered the Apollo hump shaft?
http://www.myostrichgolf.com/clubmak...roducts_id=233
I've heard some very good feedback on them.