I recently upgraded my driver shaft, and am impressed by it's performance.  I got me a House of Forged Express X Flex shaft.  I used to swing an X flex before my back surgery in '08 and felt I was back to being able to swing one again.  This one isn't near as stiff as what I used to swing and only slightly feels more stiff than what I had just prior, which was the Aldila Rip 60 Stiff.  It was a minor leap of faith with having not swung one and just deciding to give it a go.  I simply went with what I had 6+ years ago and ordered as close as I could with the specs.  I've now played 3 rounds with it, and am really happy with the results.  The best result was that it lowered my ball flight to my liking and so far hitting it a bit straighter than before also. 

Anyone else ever play House of Forged shaft, it is what the Pro Long Drive competitors use, a lot of them anyways.  It is worth looking into for those that have a higher than 108 driver swing speed.