I booked earlier this year at a similar price and we travel on the 28th of this month. This does not include in-flight service or entertainment but includes all applicable taxes. You can pay an extra $30 for food/beverege and $10 for in-flight movie/entertainment gizmo per flight.
It is certainly the best deal I have seen on a direct flight from Melbourne to Bangkok and I will let you know what the flight was like when I return.
I did receive an email last week stating that they had changed our flight and started to panic, but after closer inspection found that all that had happened was we were departing 15 minutes earlier.

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I love Thailand this much