Hi everyone,
Finally after 16.5 months my 820 visa was granted. YAY

Applied online onshore in NSW, middle of July 2015, got granted beginning of December 2016 from WA processing centre. Before my grant I was contacted by IMMI to provide a new AFP check as the previous one had expired after 12 months, however I was advised that my Medical is still valid, up to 18 months.
With my experience even not hearing from IMMI, keep the faith and hope that your visa will be granted soon, as they are busy.
See you in 801 waiting room.