I found the check-in system confusing to say the least. Eventually I saw a small line with mixed nationalities and decided this mist be the Thai flight to Bangkok. I was right. But there was no signage to indicate this. just a blank screen. And on the departure floor there was only one money change. Despite several flights a day to Bangkok they dont change baht. They couldnt even tell me what the exchange rate was. But they would give me US$$. I decided to take a chance and change it in Bangkok. Smart move as it turned out as there is no commission fee. If looking for somewhere to eat go down to the floor between departures and arrivals. A quick example - a capuccino down there was 32 CNY and on the departures floor 65 CNY. And its the latter price if you wait until after clearing immigration. The customs line on arrival hasn't changed from a previous comment.