all 3 will do the same thing, lock your axle when in 4wd and make a little noise in sharp turns, just choose whichever brand you are comfortable with.
this is just my preference. at first, i hesitated with my spartan purchase because of the lack of info on the net, then i found the jp article and some user feedback, and was a little more convinced, then i found my seller at another forum and he gave me a great price and decided to give the spartan a try.
jp magazine wrote an article on the spartan locker, take a look;
Head-To-Head Lunchboxes Drop In Locker Shootout - Spartan Locker - Jp Magazine
and here you can see some pics of the aussie, lr, and spartan, you can see all 3 are basically the same design, just the spartan comes with a hardened cross pin and bigger spring pins, as is shown in the pics.
Jeep Drop In Lockers Pins And Springs Photo
the worst thing jp could say on the spartans was that the instruction booklet could use some help, but if this is the worst thing they can say on this, i can live with it. when i got stuck on the instructions, i just gave wayne h. (guy who sold me the spartan) a call and he gladly helped me out. this was the 1st locker i installed and it seemed easy, well, at least the actual locker installation was, removing everything to be able to remove the carrier from the axle was the hard part.
don't be afraid of a little risk, we do that every time we go out to wheel.