Nearly nobody from Jetstar Australia connects into Jetstar Asia, so I've not seen any bogans on Jetstar Asia. I fly Jetstar Asia a lot, and they have always been on time, have new planes and have a very respectable client base. Plenty of business people use them and I have seen many passengers with SIA PPS tags on their hand carry luggage. In fact I gladly fly Jetstar Asia to KL, Manila and Jakarta for work. The schedules are sometimes better, with an early morning departure to Manila, and a 9pm departure from Manila, whereas SQ's earliest flight leaves SIN at 0930, and its latest flight leaves MNL at 1830-1900, making a day trip from SIN impossible.
Plenty of bogans in Bali though.
By the way, it is not likely that QF will be serving SYDSIN more than once daily within 12 months.