Flew with them last week BKK-REP (Siem Reap, Cambodia)-BKK. Both flights on A320's. The flight time is less than 35 mins (and the cruise altitude was only 22000/23000), however they still offered a meal service with beer, tea or coffee. Lounge in BKK is excellent (given it's free). Nothing flashy, but a few snacks, drinks and tea/coffee as well as WIFI and a few internet stations.
I believe the only difference between the intl and domestic service is a charge for the beer (from memory it was something like 90THB, so less than $3)
I've used them heaps of times and never been let down.