We have them. Would never order another car without it. It does make a huge difference on long road trips. Not usually aware they are on after the first few minutes. Wish the passenger side had one too- we switch off about every three hours of driving and I miss it when I'm on the right side. We do an annual trip to and from Houston & Nantucket; a Houston to Illinois run; Houston to Santa Fe and Aspen. (We have two golden retrievers so we tend to drive on vacations so we can take the dogs with us). Am thinking about heading toward the X6 next time around.