I have this shaft in a Titleist 983K 8.5* head which Joe put together. I purchased it from EBAY from the original owner. I have the "X" short shafted 1/2". It's a great shaft, smooth at impact, and tremendous ball control. The loft however in the driver is now too low, since I have made serious swing changes. I believe that forthe shaft to perform properly, a consistnetly storn move through the ball is mandatory.
I now have the Tour Spec 771Ta in a Taylor 510 TP with 10.5*. This shaft is "S" and the only diffenrecne I find is a slightly softer feel at impact.
My PCS guy is afraid to remove the shaft from the Titlesit head, as I'd like to get a 9083K 10.5 and resahaft with the same shaft.