I have flown the AY product on the QF SYD-BKK flights twice now - both in Premium and Business. They are both great products and better than the QF product to my taste. Premium seats are comfortable and supportive. Business seat/bed is very comfortable and I got a good sleep. I am 6ft2 tall and the footwell seems bigger on the AY planes compared to QF and the IFE screens on AY are bigger and higher quality. Cabin crew are all Thai and were hired by AY just before the flights commenced. The cabin crew are warm and friendly, and eager to make sure the passengers are happy. Stark contrast to the QF crew I have encountered on this route before - disinterested and doing the bare minimum. I think the flight deck are all Finnish but happy to be corrected.
Overall a great experience!