Quoted from fooflighter:
So I heard Mr Elwin say on a TPN podcast that the goal of the ball release off the building is supposed to hit the very tip of the left flipper to prevent going back up the ramp or building on an instant return and getting a ball stuck, by design .. now I'm wondering if I should add the roof mod
Still don't have my machine yet but how many with a roof diverter mod installed have batted a ball back to a ball trap since installing?
wait and see how it plays on your specific machine. i (and many others) had no issue with it, once actual balance was achieved with the machine.