I have taken my 2011 X5 back to the dealer twice but they have failed to resolve the problem of the driver's seat creaking. They say that the metal seat frame doesn't align properly with some of the other metal components of the seat base so they have ordered a new seat. I have the seats described as "comfort seats" in the UK, they have multi way electric adjustment. I think these are the same as the multi-contour seats I've seen discussed on this forum.