Wow - I am a big fan of floating having done it both in the US and Japan. But I have to say the price is ridiculous. Typical Beijing overpricing. Even in Tokyo - a place with crazy rents- the float is cheaper. And sessions only take max effect at 90 minutes of FLOATING! Not 60. Save your money - you can float in Shanghai for 328RMB - spend the extra on the train to get down there and have a nice weekend.
Fair enough, but with the train and hotel you're likely spending way more there. How many places are there in Shanghai that offer this?