I have a 2007 6.7L. First year it came out. I do not use EB or TH around town. It causes extremely harsh downshifts at low speeds. On highway I use EB which works very well when towing. Makes it easy to coast down steep grades without using brakes. I manually shift gears as necessary rather than use TH.
The first few years of the 6.7L has major issues with the emissions systems. The result was sooted up turbos. Dodge recommended running EB frequently as it would keep the turbos slides wiped and less likely to foul up. I had my turbo replaced 3 times in the first 20,000 miles. I believe Dodge finally worked out the issues with lots of parts replaced and new programming. Am now at 115,000 miles with no issues since.