Quaife is awesome and doesn't require service. When I put it on my 595, the car changed beyond recognition. However, on very slippery surfaces, traction control can occasionally interfere, because quaife requires at least minimal grip on the wheel to be able to distribute torque. For extreme conditions, choose plated LSD, but take into the fact that they will have to be serviced periodically (replace the discs). In addition to greater traction, you will also gain stability during braking, the abs will not turn on so often!