Aubusn is a cone-style limited slip. I ran one in my front axle for a couple years and HATED it. Like any limited slip, with there is "some" traction to both tires, it's great. When you really WANT it to work offroad, it's 100% useless.
For rear use in a daily driver, it would be fine, and transparant. IMO, spend similar money on a No Slip or Detroit or something...you'll be much happier on the trails.
I did something a little different. I went with a Lockright up front and an ARB in back. I figure if my air system goes down for any reason I still have a mechnical locker in the front to get me out of a stich. Tight corners are somewhat of a problem, but I turn the rear off and it stops pushing the front evenly and enables me to complete the corner. Works Great. Figured out that one at Naches in Washington, near Yakima.