I just redeemed 2 nights at Aria through MyVegas and thought I'd look up my 2 reservations on Aria's website to see if they came up. That never seems to work, but to my surprise both reservations did come up. However, I see a rate of $268 for each night -- no mention of MyVegas or that it's comped. I'm sure the man on the phone redeemed my rewards. Is there any reason to worry I'll be charged? I'm just assuming the online reservation system isn't that reliable...
It will show up in the computer at the front desk as a MyVegas comp. They are showing the "actual" cost of the room. No need to worry.