So hi!
I'm glad i read the aff newsletter as today on my flight from PER to SYD i knew what was going on... I'd selected 48B on the a330 only to find myself allocated the same seat on the 747 - a dreaded middle seat!
Got to the airport, asked at the counter and got moved to premium economy... thanks for the tip AFF! Mind you I'm just a bronze member, so while the word isn't out there might be a fair bit of availability towards the front...
I then headed to Qantas club lounge, as I'd received an email offer for access which wasn't working... they offered me a business upgrade instead for 25k points which i thought more than reasonable given I'd paid $189 for the discount economy ticket!
So while I'd love to offer my input on premium economy domestic, I really can't
But i was happy with the business seats, I expected the aircraft to look dated but I thought the product was good quality, and more attentive service than when i last flew qf business about ten years ago. (Which was an ancient 737 without even personal entertainment!!)
Given there are so many more business seats, i recommend passengers looking for an easy or cheap upgrade to consider the 747 flights while they're still running!
It's worth noting that a week before departure I was offered to bid for an upgrade which would have cost minimum $125 plus 19600 points - pretty glad I didn't bid!