Well Wavetrac is in. Pretty impressed all in. Never driven another front drive car with an LSD to compare, but I cant "notice" the diff working although the way the car digs in to, and pulls out of bends, it is definitely doing its job.
Only drawback I can see other than price is that it will show just how crap your tyres are when both front wheels are spinning like blazes in the dry in second gear! Avoid Vredstein Ultrac Sessantas if you are running big power!