I am far from one in the know, but my experience with my truck having put 150k on it myself over the last 6 years of ownership. Got the truck in 07 with 49k on it, right now its got 193k and climbing, about 130k of that is with Xtreme Race daily driven and occasional light towing. Most the truck has really seen is 10k with the utility or dump trailer. Gets put to the floor 4k RPM shifts at least once a day, always merging onto the highway around 80mph, otherwise calmly driving winding out the shifts only to 2100rpm or so.
I am NOT a maintenance freak, I treat the truck like I would any other, it gets the oil changed when I get around to it, somewhere around 10k, and nothing fancy, valvoline 15w40 or motocraft 15w40. Fuel filters get done on occasion probably once a year or so. Coolant got flushed once back about 100k ago, trans same thing, flushed once at 93k.
Repair history
55k - Had the EGR valve plug up on me around
93k - 6 injectors replaced under warranty to fix cold start issues
113k - Studded/deleted with an oil cooler (temps were 30°+ delta) and all the little updates, dummy plugs, STC fitting, turbo drain. Heads were cracked, and replaced. Had been running hot tune for approximately 30k at this point
125k - FICM was resoldered
Since then sitting has been its greatest enemy, but no major repairs, brakes, oil/filter changes, and had a oil pressure sensor go out, oh and the bed rot off the truck.
All in all I consider it decent since it's race tuned daily and I wouldn't consider it babied, drove it 1,000 miles down to TS and then 1,000 miles back getting about 17mpg.
My fathers 7.3 has 150k on it, just recently got an Oil pan and a CPS and UVCH's done, work truck its entire life. He bought a 6.0 on the cheap when the oil pan rotted out, and basically started using that for 90% of his work/driving, I think it has around 130k on it now (07 truck) its getting an FICM right now, and had a set of injectors, bone stock, bout the same maintenance schedule as mine.