I have seen the soul sucking part working a few times, and had my terrible reaction to being flung into the cameras view projected onto the mist in front of the dementor. But it seems like its mostly off or not working. One of the last times I rode it it looked like a screen saver was being projected into the face circles which was quite goofy to see. It was a repeating pattern and looked like Christmas wrapping paper haha. I think it would be great if during the times its not working they just projected 4 skulls to make you feel some impending doom or at least a sense of "dread" from the Dementors. You know, something you might expect.