Most of my subject matter exhibits the annoying tendency to move. Further, they have a nasty habit of not keeping a consistant distance from the lens from subject to subject.
Unable as I am to focus and adjust metering and aperture for each shot (the shot would be gone), I have to set the camera for between 250th - 500th and an aperture of around f/8 - f/11. This gives me a zone of approximately 15 -30ft.
With FP4+ and the low light, I could only achieve between 60th - 125th, not enough to freeze the movement sufficiently, whilst maintaining a workable DOF.
Now with HP5+, I can shoot at 250th - 500th (1000th on a really good day) and still keep the DOF, thereby seeing the shot, raising the camera and shooting in a second.