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That deep discounting just shows that the X6, like many upper-level BMW products, is simply overpriced to begin with. Yes, that includes the 550 GT. The 550 GT is a superb car (if you can get over the awkward, Honda-Crosstour-like rear end), but not, IMO, worth 70K +.
Exactly the point, there are plenty of suburb cars that are more attractively priced, with higher performance capabilities, less overweight, with better fuel-efficiency, and less ugly.