My stay was over Super Bowl weekend.
Check-in was efficient and fast. I had to point out my Marriott Rewards Platinum status so that the welcome amenity and free breakfast would be provided. The welcome amenity never arrived so I had to call down to remind them and it was brought up right away. I booked a terrace studio and was upgraded to a terrace one bedroom. Definitely ask for a room facing the Bellagio fountains.
I also requested a roll away bed and after 2 hours and 7 phone calls later it was finally delivered. Late check-out was requested and I was only given one extra hour from the 11am check-out time.
The location of the hotel is great and I would stay there again. They have a few kinks still to be worked out.