The old Idrive in my '03 745 was not nearly as good as the newer Idrive in my '07 now. Although the cars look similar, the newer 7s drive much nicer and are even more refined than the previous models IMO. More power, quieter interior, better suspension, etc. BMW has had 5+ years to tweak the 7s, and I see alot more of them on the road all the time so they must be doing something right.

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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