If booking through a travel agent, Luminous (or Stars? I forget) is offering a USD 250 credit for stays of 2 days or more. Not applicable at Porter or Duchess restaurants, however. I didn't book it because I didn't think I could take advantage, but definitely worth considering.

Titanium member, upgraded to Sublime room on the bank side. Didn't get a suite and thought the room was a bit cramped. However I appreciated that the hotel had set up an extra bed for my kid, without my asking for one and free of charge.

Tried breakfast on both sides, both were good but I liked the Duchess a bit more. The a la carte dishes at the Duchess are much larger than at Porter, so take that into account when getting food from the buffet.

Note that rates here are all over the place. You should be able to find it under EUR 400 now, but when I looked a few months ago, rates for September were well over EUR 600.