I played Friday and Saturday with my 670's and Sunday my hands were destroyed. I took 2 200mg tylenol before I played Sunday and I used my old clubs, Monday morning I had minimal/ close to no pain in my hands, same grips. I'm pretty convinced, shafts were to blame in this occasion. Before I played Sunday, I went to Golfsmith, did a test on my clubhead speed. With a driver I'm hitting between 93-97Mph. I think thats a bit too low for those project X's. I'm going to sell them if anyone is interested. Likely on Craigslist, but I would prefer to give this community dibs.
Titleist 670's, Project X Rifle's 6.5, 1/2" long. Club faces are pristine, the actual clubs are aside from the faces are in medium/good shape.