I had a lot of trouble changing a flight schedule. Paying the change fee is not an issue. The problem is there no online operation to do so. You will have to pay their New York office and then someone from China will reach back. The whole process has to be done by phone. Then you may need to wait for 48 hours to have the change confirmed. It is very inconvenient. Think twice before you book your flights.
I have flown with them before. The fight experience is fine.