Things have gotten way easier with the latest GoFigure and firmware updates. I'd recommend downloading GoFigure and then using it to check which firmware your Poly is running, then update to the latest if it isn't already installed.New Poly owner here. Are there any tips and tricks or best settings recommendations in this thread you can point me to?
Previously with Poly you had to use GoFigure to select which input you wanted or how you wanted Poly to run - i.e. via Roon or some other streaming or WiFi playback software. Now it's much easier as you can switch between WiFi playback (Roon or any other) and also playback via microSD card without having to change anything in GoFigure. That's made life way easier to many of the previous issues have now been addressed.
You'll still need GoFigure for setting up the WiFi networks or switching Poly to using its own hotspot. One tip is that Poly operates on 2.4 GHz Wifi only, so make sure your WiFi set up at home is running on 2.4 rather 5.
For microSD card playback my favorite software so far is "MaximumMPD" as it's free. It's pretty bare-bones but it's reliable and works well. Most of the time I just use Poly with playback from Audirvana while at home, then microSD (with Poly's hotspot) when moving away from my computer or out of home.
I think even with phones things have got better too - previously on the iPhone, for example, you had to set up what people were calling 'hybrid mode' where the phone would connect to Poly's hotspot to control playback, but you had to configure it in the iPhone to tell the phone not to use Poly's hotspot to look for data on the internet. But now iPhones seem to be able to handle these non-internet connected WiFi networks without any special configuration in my experience.