There's a well known fitter in my area. He's a Scratch, Muira, etc. dealer and fitter. He told me that when he fits players the hardest club in the bag to find good fit is the 3W. Head, loft, shaft, swing, ball all have to work together as much or more than any other club in the bag to find the one that fits best.
Got this off a US forum
Thoughts
I mix between
Callaway 2004 fairway 13* stock stiff
Nike sasquatch 15* Wasabi 75-S
Bridgestone J33 15* By-You 85-s