I tried the Scribe for a week. The primary reason for my return was the software maturity. I have tried and owned the Supernote and the Remarkable. The Supernote was a pretty good tablet, but the screen felt very sticky and it was thick compared to the Remarkable.
The Scribe was a reasonably good Kindle reader. However, the Notebooks and any PDFs that you added were completely separate. I travel to conferences and take notes. Prior to conferences I like to organize my motel, flight, and conference info in PDFs within a folder. You just can’t do that with the Scribe. They are lost in your Kindle library.
At the end of the day, the Remarkable is a much better choice for me.