I recently seen an add about the Eaton ELocker Differential. And thought to myself this looks like a have to have? I looked at there web site tonight and learned a little about how they worked. I know why you would want them I also know that I probably can't afford them. But what I don't know is do you really need them. Are these things a must, or are they just nice to have, does everybody want them? or are they considered cheating haha, I don't really know that's why I come here to ask! please educate me! Thanks.