So the 525i is just not cutting it.

They got a "new" 2001 ///M5 in at my dealership. It has 27,000 miles. Next I test drive an E70 4.8i.
Any comments, suggesstions, warnings before I go?
Thanks in advance.
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I have an
X and I have an
M but I still can't get any of these fandangled satellite radio stations, what gives?
2005 E53 X5 4.4 Saphire Black
2001 E39 ///M5 Silver