My silver IS300 is in but without the LSD option I was told it would have. How important is LSD? I have heard arguments both ways...a must have..to not that imprtant and in some ways a negative? Where will I notice/miss this option the most? I have already passed up one IS due to timing issues and a lack of 17 Graphite polished wheels. Should I let the abscense of this option hold up the process again? I am taking delivery of the car on September 5th. Your comments are appreciated.