The oem brakes are a little grabby on the 4.8. It has larger brake components than any other X, even compared to the 4.4. You'll get used to it after a while. The steering does feel a little heavy with the AWD, especially with the low profile 20" wheel & tire set up, but again, just something to get used to. Enjoy your new X. It is an awesome ride.

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'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4