Thank you, gentleman. It would be of interest if others could also comment on the following technical information on AHR provided by an X5 owner from Sweden, which appeared in the Roadfly forum several years back.
http://bimmer.roadfly.com/bmw/forums/e53/1090685-1.html
Clearly it states this option has a positive "sporty" visual benefit, since its lowered. Also that it rides better (enhanced ride comfort & doesn't rock on corners) because of its front air suspension, combined with the standard rear air suspension, offers the difference. According to the post, this came officially from BMW of Sweden. Is this gospel or are there many that doubt the engineering claims behind this supposedly official BMW technical report?