Just received my 915 D4 yesterday and got to play a round with it today. I'm very skeptical when it comes to new club claims, but I believe this driver was designed just for me. Although I feel it's not quite as forgiving as my 913 D3 it is pretty close. I have a upright swing which produces a lot of backspin, the 915 D4 produced between 20-30 yards more carry than the 913 D3, not sure on roll yet as it was very soggy and most drives plugged. Needless to say I can't wait to play in better conditions, Titleist made a home run with this driver.