It could definitely be worse
My truck is ready to be put to pasture, it has 465k on it, and she is showing signs of a major overhaul both mechanically and electrically. On a good note, the ISX that she has runs like it was still brand new, I have yet to have any major problems aside from the turbo going TU on me.
I love the truck but, it sounds like a new truck is in my future (again). I started out with a 770, and got into this 780. More than likely I will end up in a Petercar (379 model). That will take a huge adjustment considering the turning radius on the 7x0 series is relatively sharp.