Yes, I have played around with this shaft. I have been very happy with Accuflex shafts in the past, so when I heard about this one, I was very interested. They spent over one year with this shaft in R&D from what I understand, just so they would get it right.
IMHO this is their best shaft to date, by a decent margin. Their claims for tighter tolerances and better energy transfer hold true, in my experience. Another interesting attribute is that the shaft recovers so well that you can swing at it differently if you need to. It is there when you go at it and will also respond well with a smoother swing. The good thing is that this shaft is not all that expensive, so it won't break you to try one. Feel is about preference, but most people who have tried it seem to like the feel a good bit. The color scheme is pretty cool, especially when you get it in the sun light.
I hope they will open up this line in the future and add some different weight catagories. That may not be too far off, considering it's growing popularity.
Paul