it is with the deepest regret I crossed over to the dark side at the weekend. I've really been struggling with my 915F since I bought it a couple years back. For me the 3 wood is vital in my bag for certain holes on my course off the tee so I need one that works.
Well on Friday I got a demo of another major brands new 3 wood and was absolutely smoking it, like crazy far, I rarely put drives that distance, anyway, used it again Saturday and didn't strike it so well but today (Sunday) I used it again and it's been bought and the 915F has gone.
In the interests of loyalty I won't name the club nor will it bear it's original head cover, but I have a 917 3 wood head cover I will use to hide my shame.