Hi Alan I asked the same question some time ago not a lot of feed back. So I bit the bullet and changed mine it was on a F10 525d and am delighted with the softer ride and obvious cost mine were about £850 for all 4 wanted to do 2 at a time starting with the fronts but told un wise as it will upset the steering geometry with R.F.T.s on the rear so I was committed. Continentals were my only option because of there size. I was told they were Jaguar size and fit. I was bombarded with horror stores about informing my insurance company but the man in MOMBI he said why are you telling me this!!!! well if they are the right size and specification all will be well saab LOL. Only down side is with there softer tyre walls, it feel a little rolley when cornering under good strain, know what I meen!!!!! Hope my tale is of some use Regards chippy