best bang for the buck locker. the design is similar to a lock rite, but all lunch box lockers share a common design. the engagement cam on the ausie is far better and deeper. I also like how they use a single spring for immediate engagement as opposed to the double spring for progressive engagement that some LBL use, in turn does make it a bit louder (clicking when regular driving)
Depending on the axle your installing this in, you will probably not re-use the thrust washer. (arguable difference in strength)
if you have a CJ, regardless of what LBL you put in, look at getting a new or upgraded center pin for you diff. the factory original one probably has a lot of years on it and they tend to shear with LBL.
Down side of them, the instructions are not super clear, but if you have ever been inside a diff or have a small amount of mechanical ability, you can easily figure it out.