FWIW I just popped on the scorpions from last year and they are LOUD in my long experience with snow tires. Of course fronts are at 4-5 mm. They have a few thousand miles left at best so not exactly impressive wear. When I trash them in January they will have provided about 12,000 miles.
I have the 5.0 with AD so will admit I am wild in the corners and off ramps thus contributes significantly to my wear report.
Note I have a 4Runner running Goodyear wranglers with Kevlar belt. Quiet at 4-5 mm, good wear, and like Velcro. Aggressive tread would look cool on x5, especially with black walls. Alas, no fit options. Probably take the fun out of AD anyway.
Such are the wages.
Scar (holdover from Audi phase 1991-2003)
2012 X5 50 Msport carbon/oyster (daily driver)
2007 328 XI Sportwagon (wife)
2003 M5 chiaretto/silverstone (only for fun)
2006 Suburban 2500 (last of the truly tough off road 'burbs)
2007 4Runner Sport (for tight places)
2002 Silverado 3500 pickup (mule)