I flew from Sydney to Perth last week on a Virgin A330, and regretted not paying slightly more for Economy X, as my window seat (19A) had barely enough pitch for me to feel comfortable without getting up and moving around the aircraft.
During mobile check-in for the return flight, I decided to pay the extra $70 for Economy X (Seat 28A), and appreciated the vast increase in legroom on this exit seat, even though the priority boarding and screening benefits were not available at Perth Airport. Proximity to the lavatories was not bothersome.
Inflight experience was great with an adequate hot meal and drinks provided. Entertainment screens worked well.
For shorter flights (eg, Syd/Mel or Syd/Adel) I can handle regular economy but for future flights to and from Perth, Economy X will be a must for me.