MGM Grand Prima reservation worth it?

I'm going to be in Vegas December 21-25. I'm planning on using my monthly 3 free night email offer while I'm there to stay at MGM Grand. I'm reading about this Prima reservation where you post a non refundable 500 bucks to your room when you check in and you receive a bunch of discounts. I'd like to use it to get the free upgrade to a spa suite, and I figure that I'll spend at least $500 for food/drinks/massages/shows while I'm there. Is this worth it? Also, I can't really tell if it is combine-able with my 3-free-night email offer. Does anyone have any stories of using these two deals together?



Please, only answers from those who have used the Prima reservation before. Please let me know your opinions and stories of how well it works. Thanks!MGM Grand Prima reservation worth it?
Yes, it's worth it if you were going to spend the $500 anyway.



However, the fine print says:



"Not available for existing reservations. This program is non-transferable, subject to availability, may not be combined with any other MGM Grand promotion or program"



So I think you are out of luck with your 3-nights free deal.MGM Grand Prima reservation worth it?
I would call the MGM and make sure this is a real offer. Free should not involvle non-refundable money. Sounds like two different offers!!! If it sounds like a duck, looks like a duck, is it really a duck