http://www.gm.com/guarantee/terms-an...ction_|_60_day
Better not plan on returning it to GM. If you read the fine print you will see that the program ends on 11-30-09. I see yuo take delivery in Dec. If you do take delivery in Nov. , Make sure to read the link above as it will cost you some $. You have to license it and keep it a minimum of 31 days.
Hope this helps with the decision, I was hoping mine would be here before Dec. but only so I could take the $500 rebate instead of the 60 day return. My 2ss rs comes in mid Dec. and I'll still be happy to pay the $42000