For what it is worth, I am having my wedding at the Blackstone this year. They showed us the rooms - ok in my opinion, but nothing to brag about. Being a 5yr plus platinum I figured we would get special treatment, but that has not been seen yet. It is a historic property so we need to deal with the "older" aspects of the hotel - but we have had several business meetings there and the conference rooms have been great.
Merkat (the restaruant) is great though