On install day, the speed test was showing 650, however 3 days later, the speeds have dropped to around 225, lowest being 165, increased contract but a slower speed tha I was on Fibre 500
Wifi speeds fluctuate and no isp will guarantee wifi speed.
Having said that I'm assuming you're using a SH2.
Speaking from experience going from 500mbps to 900mbps on a wifi 5 router is completely pointless as you will not notice any difference over wifi in the everyday world.
To take full advantage of a 900mbps package over wifi you'll need a wifi 6/7 router.
