Fuck! haha I just spent the last 10 minutes looking for that thread, finally found it and you beat me to it
I find it weird that he said the exceptions were mud, sand and snow... Those would be the 3 places I would think A-TRAC would do best. Places where you can really get on the throttle. You have to give it some throttle to get the sensors to notice the wheels are spinning to get A-TRAC to start working. Those 3 situations make it easier. A-TRAC sucks for rock crawling though. Pretty sketchy to have to give it enough gas to spin the tires when the tires are on rocks. haha A-TRAC is all about using a little speed. I love my lockers because you don't need that speed.