I flew Jetstar by accident last week. I won't be doing it again if I can avoid it. I am quite prepared to pay more to avoid being squashed into the tiniest seat pitch in the known world with hundreds of bogans - the one next to me couldn't even understand how to undo a seat belt. A successful evacuation in such an aircraft would be an impossibility. No IFE and the cramped conditions means that eating and drinking is a waste of time and energy.
As for flying Jetstar internationally, shirley you must be joking. No one in their right mind willl willingly submit to cramped conditions and crap service on a long trip except an uneducated, first time flyer bogan.
My girlfriend and I have used all our Qantas frequent flyer points as well in anticipation of their value being downgraded.