I have a mini with a rear lockrite. Sometimes I wonder if a spool would be better since the locker bangs and clicks and pops and tires still chirp and skid on the street. when you accelerate or brake on an "almost straight" road I can feel the drive wheel shift side to side by the way it pushes the truck around. My cruiser has factory electric lockers and selectable are so much better. Road manners are way better with open diffs and can turn tighter on the trails when they are open. On a side hill I can also use open diffs and minimize the side slipping. In fact on the Rubicon trail last summer I was one of three 80's in a group and the only one to kiss a particular rock (on a slippery side hill). I believe I slid into the rock because i forgot to disengage my rear locker. It costs more money but when I regear the minitruck it will get selectable lockers. Of course I just finished cleaning and rebuilding my rear electric locker actuater. An Aussie/lockrite or spool is certainly a lot simpler to install and maintain.