I for one have 135,000 on my 2007 6. 7 and would take it anywhere. Any CEL I have had are minor. Any Warranty issues were handled promptly, politely and expertly by the dealership. Only down side if you want to call it that is the oil change interval is 3500 miles due to the excessive soot contamination of the oil. I have no complaints and would do it all over again. I plan on running it for at least 1,000,000 at the current rate.
Pretty much same here with CEL's, after the last reflash the P242 was back within a week. I can clear it but it comes back in a few days. My oil changes haven't been quiet that frequent in the first 20,000, they have been averaging just over 5,000 miles each. Just some nuisance items with the truck but nothing I would consider serious, I would still do it again.