Just my $0.02 on an Aussie in the front.
No complaints so far. I'm a fairly mild wheeler normally but I do get into some bad stuff occasionally, and the Aussie has never failed (I've been stuck but the Aussie stayed locked).
It is rather loud when it unlocks (you can
but I that's ok. And it does take quite a bit of pressure to unlock.
Obviously, I never drive it on the road in 4WD.
Mine was set up as a complete third by Zuk for me and I installed.