If it is a nice DD and you want it to stay all smooth and soft, get a LSD. A welded diff feels like what it is, hardcore. You will hop, tires make cool sounds, and people look at you. You will think your car is breaking, but it's not, it's not for everyone.

Welded diffs eat tires as well, and from what I have heard, can be dangerous in the rain if you are not paying attention.