Spent two nights at the Miyako Sheraton last week - quite a letdown in terms of "upgrade" I was "upgraded" to the room type I booked... As I'm not too keen arguing with the Japanese with all the culture and linguistic barriers, so I just put a note to self - don't come back here.
On a brighter note, the new club should be opening this week (and the breakfast options in both lobby restaurants + the drinks in the lobby bar will go away at the same time)
@ZenWorld - the website is the website of Miyako hotels. I don't really understand the relationship between the two chains (Starwood & Miyako) - Japan is a strange place

There seem to be similar arrangement e.g between the Marriot and Asocia chains (e.g in Nagoya) and AFAIK some ICs operate like this.
But an interesting idea is to try to use BRG