Just completed a brief, last minute stay. Booked on points, TSU to Lagoon View Suite. Best hotel redemption ever (Andaz King was going for $800 per night). The physical product is fantastic. Rooms are beautifully designed, furnishings are gorgeous (no pressboard furniture here), unusually high quality construction for Mexico.
I thought the staff was fantastic - warm, genuine, and helpful. There were a few minor service glitches, but these were always resolved quickly with a smile. Note though that for anyone who goes in with the attitude of "I'm paying $800 a night and demand perfect service," disappointment will likely result (as it obviously did for the American women who had a screaming meltdown at the front desk over a nonfunctional key card).
Breakfast was excellent, but I was unimpressed otherwise by the food.
Plunge pool was great, heated to the high 90s, with a single very strong jet.
I will definitely return. Wouldn't hesitate to pay $400+ per night, and would also consider paying to upgrade to one of the various beachfront suites.