I personally like the blind spot detection, and the side cameras. I am finding I'm using both all the time.
The HUD is simply a MUST, in my opinion. I would actually go as far as saying if it was not for it I would not have gotten the 750. It is really really useful, the tech that actually works.
BMW 750xi 2012 Executive|Technology|SportM
Lexus LX470 2006 | Mercedes SL500 98 | Diamond DA20 2006