Well I have now finished my 318k award, I feel safe to post here.
Had huge numbers of issues, along with most people. The worst was the loss of my WAW-xDOH-DEL QR flights (along with multiple others). Unfortunately, this happened after I had already commenced my journey so according to the rules I could not make any changes to the route. Given QR refused to release any seats, I thought that I was done for - and best case scenario, thought I'd have to make them surface sectors and pay through the nose to get those as one way seats.
I talked to what seemed like a fairly clueless Fiji agent, who I managed to convince to change the routing to WAW-xLHR-DEL. She did, but it never ticketed of course. I phoned again, and they said would ticket within 24 hours, didn't of course. Fortuitously this was when QF started their email to fix stuffed reward flight bookings. It ticketed very soon after that, no questions asked.
My final routing was syd-dfw-eze-mad-prg-hel-waw-lhr-del-mel-syd-mcy with stops only in EZE and PRG as it turns out. I was meant to have further stops in WAW, DOH and DEL but all the flight changed put a stop to that. I had <24 hour stops in WAW, LHR and DEL which at least allowed some sightseeing.
A map from the Great Circle Mapper .. which at 34996 miles is perilously close! I suspect since the QF calculators often go over gcmap, I reckon I might have fallen foul of that rule too!
Did I get the best value out of this? Definitely not, too many compromises. Will I do it again? Not until they fix the difficulties in booking and changing.