i'm using RBallz driver for now, Med Trajectory .. some nice roll out on the fairways with that traj .. but i often turn it into a med/high traj just my adding lotsa backspin .. riding the wind like MB said .. or clearing a fairway bunker & landing soft to avoid a visit to the rough on the the opposite of the fairway .. BP comes to mind ..
i prefer high trajectory though, more options for sailing the trees and precision driving IMO