I had 2 very different PB experiences in the last few days.
QF663  departing BNE on Sat - 1 FA at the scanner, very long queue in the non  PB lane, empty PB lane. I walked straight up to the top of the PB lane,  the FA leaned over to take my BP and I was on to the aerobridge in  seconds with only mild dirty looks from the non PB lane.  Proof that PB  can work, and more importantly that it can still work even with only 1  FA.
QF660 departing ADL on Friday - oh dear.  Departing gate 20  again, and the signs are still conflicting even though I reported this  about a month ago both here and direct to QF.  The large sign and the  announcement said PB to the right, the small sign said PB to the left.  I  mentioned it to the ground staffer behind the desk - it would have been  difficult for her to have cared less about the discrepancy.  She could  not have given a rats, that much was obvious.  I mentioned it again to  the CSM on board.  Initially he said nothing.  Then we had a short delay  and he came down to Y to tell the pax in rows 4 and 5.  He told me he  had asked the ground staff about the signage discrepancy and had been  told that PB doesn't work at ADL because the large sign "interferes with  the monitor".  He also told me that PB would be being phased out as  more flights move to 4 FAs instead of 5 because "PB doesn't work when  there is only 1 FA at the scanner".  I told him Virgin can make it work  and that some people choose to fly VA out of ADL because of it.  He was  absolutely astonished that PB mattered that much to anybody.  
QF  still apparently has some work to do training ground staff and flight  crew about status benefits like PB and how they attract loyalty, and  also how it can engender disloyalty when advertised benefits are not  provided, or not provided consistently.
I've passed the QF660  feedback on to QF via the feedback panel email so I eagerly await the  airport manager's call so he can explain to me how PB "interferes with  the monitor" at ADL