is it blatantly obvious if they are gone? cos im sure mine must be knackerd by now?
you'll have rear wheel steering. it will feel like you're going to die if you approach 30mph

you'd need to constantly correct the auto-rear-wheel-steering of the car, whilst driving in straight lines. essentially you end up snaking down the road!
other than that, no noises, rattles or bangs, as the rubber was still there. It was just broken up into various chunks.