After visiting some mates in Pattaya I was off to Siem Reap, so attempting to avoid the trip to BKK I searched for a direct flight from U Tapao. Found a company, Legacy Air.
Booked return flight for the dates I wanted. Price $280. Fine. Two days before the flight I get a phone call from a Russian chap telling me my flight had been rescheduled to Suvanabhumi, flight times almost identical so no real inconvenience apart from a longer trip to the airport and immigration delays.
In fairness the chap from Legacy Air did come to my hotel with the new tickets and paid for the taxi to Swampy. The new tickets were for flights with Cambodian Angkor Air, a very pleasant flight, good snack box on route dispute it only being a 50 min flight.
So no real complaints but I do hope Legacy Air can get enough customers eventually to get this service truly up and running.