I was playing around on their website, and they have a page devoted to tier matching. Not only will they match tiers from around the area, but each match is linked to a free room.
Diamond match gets you 1 free night. Mlife Platinum gets you 2. Lower levels get a 25% discount.
Unlike Revel, who didnt want to match and comp anything at opening, looks like hard Rock is coming out swinging for players.