I'd like to take some slow-motion video of the DP lock shot as it starts to enter the katana ramp. On mine it gets rejected about 50% of the time, but man, when you hit it right it sails up like butter, especially the super skill shot. When it gets rejected it seems like it might be hitting the pop bumper skirt or something, I don't know.
I kind of like that you have to shoot the ramp perfectly to get the lock, otherwise you'd have ninja multiball all the time.