Just returned today from a week stay for a conference, and I have to admit I have mixed feelings about the whole MGM / Hyatt thing. I would suggest that you hit the MLife desk as soon as possible and get your upgraded card -- particularly if you've been matched to Platinum, as just showing the card tends to quite literally "open doors" for you. Also, make sure that you confirm with the front desk that both your Hyatt and MLife numbers are on file in the reservation. An important note is also to find out where the VIP registration desk is. Chances are nobody will volunteer this info -- or at least they didn't in our case -- but there's always a VIP check-in lounge for elite members. At the Delano in particular it is to the left of the main registration area, behind an unmarked door, basically obscured from view of the commoners by frosted glass. In there you can find a couple of very helpful agents, refrigerators with sparkling water, juices and even beer and eager folks that will gladly make you a cup of coffee while you wait. I received no upgrade from the suite I booked, although it was expected as I was told several times before my arrival that they were "fully committed" -- even when I attempted to pay for an upgraded room. I'm not entirely sure if things would have been different when they weren't hosting a large conference, or if they would have simply offered an upgrade to a higher floor or different view. The lady behind the desk was extremely helpful though, even going as far as calling the Mandalay Bay to check if any rooms -- better than the one I had booked -- was available. Not much to complaint about though, even the basic suites are very large, with a separate living area, wet bar and 1 1/2 bathrooms. No pullout sofa or motorized blinds though... Otherwise there was not much else in the way of Hyatt "acknowledgement" and all the perks came from the MLife status itself. There were two bottles of water and some chocolate waiting in the room and I received a late checkout even though I requested it an hour before I was supposed to depart (checkout is supposedly 11:00am). I should note that the MLife status is not necessarily small potatoes though. To reach it on your own you need to accrue 200k "Tier Credits" which is somewhere around $8k in hotel spend, depending on who you ask. You can soften that up with gambling, but either way it's not all that cheap to achieve through MGM directly, so it's a welcome "perk" to have automatically as a Hyatt Diamond. There are also additional perks that seem to be known but not published, not even in the MLife literature or website. MLife Platinum members get 10 tickets per calendar year to the "Secret Garden" exhibit at the Mirage (which includes the dolphin habitat and tiger / lion mini-zoo that Siegfried & Roy keep). If you were to buy these yourself (assuming you're into that sort of thing) you'd have to shell out $20 per adult ticket. You also get complimentary access to the Mandalay Bay Shark Reef Aquarium (another overpriced tourist trap, but still saves you $18 per adult), access to the Gallery of Fine Art at the Bellagio, the Race and Sports Book Skyboxes at MGM Grand, access to the House of Blues Foundation Room at Mandalay Bay, etc. Overall it was an interesting stay, although I felt more like an MGM elite than a Hyatt elite while there. I would have liked to see a tighter integration of the programs as you have with IHG, where you have the program manager at the hotel come and meet you in person at check-in, or when you call the valet and they tell you that your car will be prioritized because of your status (whether this is true or not ). Not at all a bad experience, and I guess I'll see how things play out in different properties as I return over the next few months.