I have adaptive drive in my 07 and i love it. I just ordered a 50 last week and the dealer was questioning me why spend the $3500 if I don't tow or carry 4 football players all the time. Needless to say he had me questioning if I should get it. They had a adaptive drive and a std sport without the adaptive drive and drove them back to back. I drove the same route and tied to keep the same speed. There is a huge difference between the two. The adaptive drive allowed me to hit the off ramp about 15mph faster and the car felt much more planted compared to the non-adaptive drive car. Needless to say I paid the $3500 more.

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500