I'm on a Gigatown 1000/500 plan in Dunedin but my performance has been pretty bad this last week. Steam downloads are noticeably slower with them struggling to run at greater than 50 mbps, although when I did a download from Battle.net yesterday I was getting 20-30 MB/s which is what I would expect.
Router is an Asus RT-AC87U, seeing similar speeds over AC Wifi on my laptop and my gigabit wired desktop. Right now Steam doesn't want to go past 24 mbps which is pretty bad. I restarted the router and kicked pretty much everything off the network and ran speed tests from my desktop (router showed < 5 kb/s traffic before running tests).
Linux Iso via canterbury mirror (max I saw was 3MB/s):