I have both Nike Vapor Fly and Callaway SH XR.
If you have other Callaway Fusion Series (Driver & Wood) and like to synchronize the meter speed like I do, I see no reason why you shouldn't purchase it.
Having a uniformity of meter speed enables me to perform at my best.
Plus, it's a great eye candy as a part of your club collections. WGT wouldn't mind it, either. ;-)