I only miss having them when I want to wash the moonroof. During the test drive though I swore it was a definite no - way too far to step out. Personally don't think it adds much to looks otherwise I would've gotten them just like everything else I've done so far.

I've seen Lincoln's implementation and it's pretty sweet... YouTube - Power Running Boards (functional, not for aesthetics).

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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