After 2-1/2 months of ownership I find the 2006 BMW 750Li a dream to drive. I don't understand what all the fuss is about the I-Drive. It's very easy to learn and once you do it's very convenient to use. I also think the interior room, especially for back seat passengers, blows away the competition.
Hard to pick which are my favorite features but I do truly love the voice activation features and the BlueTooth technology phone.
The one feature I had on my 2001 BMW 740IL that I miss is the power retractable mirrors. It was nice when parking in tight spaces to fold them in and allow more room between vehicles. I'd also enhance the voice activation features to allow more direct access to functions.