There are threads on the pros and cons.
http://www.2addicts.com/forums/showt...=982936&page=5
This thread is about changing the final drive ratio. Turner Motorsport who knows what they are doing highly recommend the Wavetrac. I am absolutely happy with my choice but haven't compared side by side to other LSDs.
http://www.2addicts.com/forums/showthread.php?t=1113986
There is not much that can go wrong changing a diff so warranty wise it doesn't have a lot of implications I think.