anyone have experience using this? particularly wondering if anyone was able to book it through a local agent.
When I was a young buckaroo in Singapore, I used to fly on Bangkok Air from Singapore to Samui every few months. I’m usually a little tense when I fly and their Fokker planes were a little old and noisy for my liking. In fact, I can remember getting on the plane (which was not air conditioned when we boarded) at the peripheries of Changi Airport and thinking “oh shit–I hope this plane makes it there in one piece.” They use an older fleet of planes. Not as dodgy as Lao’s national airline though. 
Well it says [quote]Currently, it is not possible to purchase the Airpass through our web site, please contact your travel agent or our representative offices for more details.[/quote] so you should be able to get it through an agent.