MidwayJ I put one in my 5 wd. last summer and it made a big difference over the stock shaft(Project X Callaway). I did tip it an inch, because of the higher head weight, and play the same shafts, untipped, in my drivers. Crazy that they were only $9.99, as good as they are. (think they are discontinued now, the black/grey ones)
I'm one that has never used fully inserted shafts on the SMT heads. I always go a max of 1 1/2", using a spacer made from an old shaft tip, or if needed, a long weight. The drivers have always played great for me doing this.