I have a manual 80....very heavy at 8500lbs with Harrops. They lock and unlock faster than my ARB’s did and much faster than OEM. I have never had Any issue with my harrop unlocking. The only time they unlock is when I turn the dial to unlock.I think with the Harrops I would need to increase my crawl ratio, in order to keep a constant low enough speed with plenty of torque. Otherwise the stop n go with some roll back of the vehicle while climbing , might cause grief in unlocking. I am considering the E lockers but I need to handle my crawl as well
I did however have issues with my rear ARB locking and staying locked. I have video of my rear passenger wheel not moving at the same rate as my driver wheel and the ARB was locked.