I've got two Detroit Tru Trac 's , in two different vehicles , still have em both , still like em and yes , I would buy another one if I needed to .
I did the install myself , one is a 94 w/ 2.5 and 4.88's , the tru trac is in the rear , it's a Dana 35 C , road manners are excellent and have been for over 100,000 km . It was open 4.11 before.
The other is a YJ too with Waggy Dana 44's & 4.56's , the tru trac in that one is in the front , It works very well and has since 2005 without problem .
Doug calling them junk doesn't mean alot to me , I'd ignore the "junk" comment , as already suggested .