I've had mine for about three weeks as well. So far mixed impressions, slightly underwhelming. Granted I came into it from an Audi RS4 and Lexus LS. The 750 so far seems like a compromise: does not handle even nearly as well as an RS4 (the steering is the first thing that makes your roll your eyes), hack it actually does not handle any better than an LS, but it is a lot noisier, much less refined. But all-in-all, it is still a decent car. Just not "wow" by any standard, I'd say.
BMW 750xi 2012 Executive|Technology|SportM
Lexus LX470 2006 | Mercedes SL500 98 | Diamond DA20 2006