Welded differentials.....who is willing to admit that they have done it?

I have a friend who did it to his current daily driver '81 Datsun 510. He said he loves it and is a blast on the dirt, his only complaint is that tight turns while parking are noisy and difficult and that he goes through tires a lot quicker but tires are also dirt cheap on his car so it doesn't bother him too much.