It's always nice to hear about E53s with such high mileage. It gives us all hope. I do think you've gotten pretty lucky with yours. Mine has 107,000 miles and has had 3 door carriers and I just replaced my 7th window regulator. My moonroof is FUBAR but at least I got it closed after it got stuck open. I have not dared mess with it for fear it'll get stuck open again. A new moonroof cassette is much bucks that it might as well be a bad transmission.