I am pretty impressed with the AXIV core. I put it on a 8.5* Adams 9032LD at 47". It took a few swings to get used to the non-long drive club, but once I had it dialed in the shaft would take everything I could put through it. Ball flight was good not too high and spin looked good. I have yet to hit the club on course yet, so I don't know about distances, but from the looks of the range balls I was getting good roll. I am playing Saturday, so I can let you know how distance is later in the week.
If you are on the fence on trying this out, I would give it a shot. The link below has the shaft for $85 and you can't go wrong for that price.
http://www.2puttgolf.com/USTmaster.html#anchor_428