I've actually spoken to a number of Diesel techs now on the issue.
I too, read lots of posts from owners (not mechanics, but just average guys who happen to like trucks) suggesting the switch to ELC.
Every powerstroke tech I spoke to said it was a bad idea. They all gave the same reasons. *The all explained the #1 reason for the faults is owners not servicing their vehicles. The coolant should be flushed regularly if the truck is used in 'extreme' conditions. I.e, 40-45k.*
Their is also a percentage of people that will have problems because they cranked up the boost and beat on the truck. The truck was designed around certain parameters. If you exceed those you will have trouble. I'm not a diesel guy, I must disclaim. But when I build a race car I select components based on how much power the car will make. I.e, what type of steel the crank will be forged in, which block (splayed caps or not), what my ring clearances will be based on turbo/blower/na, which pistons and compression ratio to use, etc. * If I stuck a big turbo or a blower on a stock engine I'd expect it to eventually explode.
Then of course their is the third issue, which is that these trucks are turds.
I've spoken to NUMEROUS techs since I bought my truck. They all said the 6.0 was a problematic engine. There is other design flaws around the truck as well, and I'm starting to hit a lot of them. Frozen caliper slides, EGR valve sticking (twice this year), front leaf springs are almost junk, ball joints, factory shocks blown, and rear leaf spring problems. *
The truck can't actually be loaded to the GVWR because while the axles and tires can handle it, both the braking system, frame, and springs cannot. Loaded the truck cannot be driven on uneven road surface or the trailer hitch will hit the ground, nor can the brakes stop you in a reasonable amount of time should someone cut you off.
However - for pulling a 7500lbs trailer, I'll admit it's got more power than any of my other trucks..
Just keep an eye on it, because it just isn't happy unless it's at the dealer every other weekend!