Yes same with anything I suppose.
The trouble apparently with LSDs, is when they get "loose", which apparently happens when you do donuts or just too much side ways action. This can stuff the diff very quickly.
You can get gears put into one, IE a rebuilt one. But I just chanced it for $400. The guy selling it sounded fairly genuine. Had a HSV, and put in different type of LSD. in the ad he specifically said it was tight and had no play. For me the risk paid off. Do some searches on here for LSDs, because the are many, many posts about them. And people with a lot more knowledge than me.
Oh and it is worth it. Once you have one in you will never want a car without one. Is your car the NA 6 or SC?