Great car, "but" -
If you're not already aware, keep a very close eye on the S63tu (engine) service bulletins as you own it. The N63 (lower spec 4.4 TT) has been a
nightmare reliability-wise for BMW, and they have done tens of thousands of engine-out timing chain replacements (and thousands more whole engine replacements) because of intrinsic flaws in the timing chain and engine design.
The S63 and the S63tu, by contrast, have maybe 1/100th the build volume of the N series, and by contrast they have NOT issued a Customer Care Package for the S-motors.
Why does this matter? Because some of the S motors have been exhibiting the same problems.
This was the chief reason we got rid of our X5M - too much risk for my taste. Modern BMWs are great driving cars, but they don't spend enough time driving as they should.