It won't unlock as long as there is power being applied to it, which I suppose could happen if you're cruising down the highway and hit some ice...

IFS strength is a valid issue, but in most situations you get a bit more traction from pulling (front wheels) then you do from pushing (rear wheel)..

The Aussie is a great locker, I'm just not a huge fan of how it changes low speed manners. It might be less pronounced on a stock truck with stock suspension.. Dunno.. I was running 35s and basically I resorted to coasting around any sharp corner.

For a little more money - a little more being $450 or so, you can get a complete e-locker 3rd (used) in a stock ratio... That's what I choose to buy for the current rig. It'll go in the rear, I haven't decided what to put up front.