I have not driving a F15 with ZDH but I have had 3 e70's with Adaptive Drive(DHP in f15 terms). My 2011 was in the shop for 63 days straight and I was provided a 2011 with identical spec down to the wheels except it DID NOT have AD. It was very noticeable not having AD. When I finally received my 2012 replacement and I swapped from the Non AD back to a X5 with AD it was like it was a completely different model car.

I can only assume that the DHP for the F15 would provide the same results.

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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