I have a few recent flights to report on:
QF598 (PER -> BNE), 19th June: success, but I arrived quite late, so normal lane wasn't very full anyway. I commented to the FA who scanned my ticket to the effect that "Next week I'll be able to use the priority lane" (WP now, SG then), and she said something like, "Oh I would have let you in as a gold member anyway." I thanked her for the thought, but also said (nicely) that she shouldn't do that.
QF661 (BNE -> ADL), QF587 (ADL -> PER), 22nd June: definite success! I arrived a little late at the QF661 gate, but the normal lane was still very long, and the priority lane was empty. Was in J, so walked straight up and on in the priority lane. QF587 was also a walk on in the priority lane, even though normal lane was long.
QF916 (PER -> KTA), 22nd June: both lanes were pretty much empty, so success, I guess.
QF915 (KTA -> PER), 22nd June: failure. No priority lane. But it's KTA; I didn't really expect one.
QF648 (PER -> MEL), 23rd June: both lanes were fairly empty, but priority lane was more empty. Walked on. Success again.
QF610 (MEL -> BNE), 23rd June: success. Was quite late to gate, but again, walked straight up and on through the priority lane.
This weekend experience gave me great hope for the process, but alas, come Monday morning:
QF589 (BNE -> PER), 24th June: absolute failure! Flight was delayed by ~20 minutes or so and PAX just jammed through both lanes at once when boarding was called. Announcement regarding priority lane and boarding by rows was made, but completely ignored by PAX and FAs scanning boarding passes.