I'm on 20,000 miles with a phantom grip in my dual duty street /autox GTI. Having never had an LSD in a semi-powerful fwd it is soooo nice to have two tires turning under power. Last week was the first autox event with it and I was all smiles. Now for the negative. i'm told I should expect the Phantom to leave me with a blown up diff in another 30,000 miles or so which will suck. Due to the muich harder material than the internal componenets the rub against self machining is inevtiable. I did not know this when buying it or I would have gone a different direction. You also have to hand grind the spider gears to make it fit right. my tranny gyu was flaming pissed off at me for buying such a poor fitting product. BUY the OMP!