The usual wonderful service you expect from a Shangri-la hotel plus the added luxury of the "special". Our rooms were spacious, well furnished, spotlessly clean and had nice (albeit small) balconies overlooking the Chao Phraya river.
The extras provided by being in this wing included free cocktails in the early evening, free afternoon tea and breakfast in a quieter place than the main breakfast buffet. It will be hard to stay anywhere else in Bangkok after this experience.