I'm glad to here such good reports. I was there in September, and it was clear they opened before they should have. Couldn't adjust thermostat, stained carpet (in a brand new hotel!), a comedy of errors in trying to clean the carpet, etc. etc.
The hotel is stunning, although the deluxe room I got was small for my taste (I'm a Platinum) and due to heavy occupancy, no suites available (even though it was a special occassion, wrote in advance, etc.).
It even took them two days to get a fan in the room! They wound up comping me for two nights plus free buffet breakfast for two for all nights (the best I've had at a Hyatt except for Park Hyatt Sydney). After that, I was happy (I was paying 50% off the other nights). However, there were some mighty PO'ed platinums.
The location is the best too. If they've got the service bugs worked out, it's a step or two above Madelaine.