I have an Excursion with the 6.0. I do like it very much. Had it since new. Needed EGR work many times but since I can only buy low sulfur diesel now it seems to be a non issue. The programming however is crazy. Every time it get reprogrammed something changes dramatically. I have gotten as high as 22 MPG on the highway and as low as 15. It has had a very quiet idle and a very noisy idle. It has had fantastic power and sometimes very good power. Funny thing is I think the fantastic power was also when I was getting 22MPG. Also starting can be good or difficult. Right now when outside temps are 50-65 it is very hard to start. Warmer or colder it starts right away. So I guess as with any modern diesel the programming is everything including reliability. The older 7.3 should have less issues