No idea about Shanghai, but I flew via Beijing in last February, and I enjoyed it. Experience was not really comparable to other good Asian airports like in Japan, HK or Singapore but definitely better than all the US airports I have seen. Airport people were professional, service was good, and there were every amenities you would look for. If you are interested, you may take a flight next day, and see around Shanghai. Visa is $30 and I spent less than $200 in taxi, train, food, hotel and seeing around Beijing during my 24 hr transit.