There are a few options for the rear. I have a lock right, and like the aussie, I haven't had any problems with it either. The tires will chirp if you gas it around corners and in parking lots, you can hear the locker clicking sometimes, and you will notice some weaving on the highway when letting off/getting on the gas. But, all that is to be expected. Great locker for the price.
I have about 6 years on both of my lockers, both DD and weekend warrior. Both are still working like a charm and show minimal to no wear.
I did have to replace the little springs in the lock right a few years ago, but that may have been my own fault.