Got it on my X6 M50d. If you have Adaptive Drive it firms up suspension and steering. A very noticeable difference as can be switched on the fly. Some twisty roads round here and I keep mine in Sport mode all the time :-) ps. It's an AC Schnitzer I-drive cover, just had it fitted yesterday :-)
pps. how old is that pic above? The I-drive looks like an older version??