I just was diving in PG with 2 daytrips to Verde Island.
All I can say fantastic visibility, the corals in the shallow getting better each visit and the party was like to be expected in PG.
The watertemperature was a bit chilli at that time of the year...
One thing I did not like were the huge amount of Koreans eveywhere. They are not good for the Corals and the nightlife.