Even though SaiGon airport is not as great and modern as Ha Noi airport it's still at the international standard. The waiting room is spacious bright and cool. The services there are very good and people are extremely friendly. It took me only about 20 minutes to get thru immigrations. (Yes it could be worse sometimes it could take up to 50 minutes but it all depends on the time of the day and how many flights arrive at a specific time.- You can not really blame on the immigration officers.). I can assure that the immigration process at Saigon Airport is at least better than the immigration process at Singapore Airport- It took us at least 1 hour just to get thru immigration there).