I have a lock rite in the rear of my truck. in the last week I have put about 500 miles on it. Its not bad at all. Ive had it bang once so far in a parking lot..and clunk clunk clunk weaving threw a gas station getting to a pump, and doing a few u-turns. normal of any automatic locker.
My trucks a 5spd, and I can crank the wheels full lock and back it up in my driveway, if I'm carefull with out chirping the tires.
The only place I reallly notice it is, if Im pulling off from a stop light that's up hill and a really sharp corner. Then I get a little tire squeal.
The only thing I have found that could be, or get annoying is that you can not bog the truck down as much in a parking lot,while weaving around, with out putting the clutch in. Or it will start to lurch and little quicker vs being open.
if you learn the theory, understand how a automatic locker works and adjust your driving to it, you could almost never even notice it's there.
