Sorry I can't add from personal experiences, but I am lurking this forum to get a feel for these vehicles. I absolutely love the E53s, and would like to pick up an Xdrive model. But I can't have all these problems in a vehicle like this that I will take on long trips and daily drive. I have an E46 M3 to look after as well, so I've got enough maintenance on my hands there. I am leaning toward a GX470, even though the X5 styling, power, handling and sturdiness are much better. I know the GX would be no fuss.

It seems your vehicle problems are completely rediculous failures that I would be at a point where I get rid of it. A few things here and there--no biggie. But suspension issues, AC problems, electronics--that's BS.