I've just read that they're beefier and can last forever if you keep them greased and maintained. I've never felt like the existing links, the original stockers and the subsequent moog replacements, are especially sturdy or reliable for anything other than road driving...
All I can say is that on my drive to work today, I didn't notice any difference. I'm guessing that with something like this, on road, one wouldn't really notice a difference? I have yet to go off roading with them on. I'm thinking about going off roading the 29th, so if I do I will report back.