This may be slightly off topic here, but can anyone attest to how easy (or difficult) it is to sync notes off a SuperNote to some other service? I like the idea of these E-Ink tablets, but was turned off from the Kindle Scribe as it seems there's no way easy, consistent way to push those notes out of the Amazon Kindle ecosystem.

Very easy, google drive and other cloud providers supported natively. I sideloaded SyncThing instead. They also have their own cloud that is free to use AFAIK, but I don't use it.