For those who think it's turbo lag... the lag that occurs when you're at low speed then try to accelerate (such as when slowing down for a turn then mashing it)... this occurs on a 3.0si (and I'm sure 4.8i) as well... and I've heard of it on M3s. So it's not just turbos or diesels. Same with the acceleration from stop. What I'd like to hear is which BMWs from recent history DON'T have this problem.

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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