This is my experience - it just works! Not encountered any major issues so far. As for maps, my unit by default shipped with the whole of Europe installed. That takes up about 6GB and the Explore has 16GB internal storage, just like the 1030. Adding new countries is easy if you follow DC Rainmaker's guide here:
https://www.dcrainmaker.com/2019/08/...rmin-edge.html
For big countries like the US you're talking another 5GB and much less for smaller European countries - so easily achievable with internal memory. I see no requirement for using an SD card based on this, and you can also clear and reload maps you're not using.