^ this needs further testing. The only difference I actually feel is the softer ride when going over rougher roads when the button is off. You can hear the suspension give a bit more too - it's a distinctive (not so attractive) sound - I only use it in some uneven city streets and notice/hear the difference right after pushing the button off. Don't feel a difference in throttle... will need to test that more.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr