I visit Bangkok regularly and have used this airport numerous times. It is a modern, very large airport and despite having moveable walkways, getting to/from departure gates takes a considerable amount of time. Be prepared for long walks. Layout/design of the arrivals hall is poor. The exit configuration was changed after the airport opened 10 years ago, but it has never worked successfully. Visitor waiting zones are crowded. Getting between floors is also confusing as some escalators have access restricted.