The size is good for PDF reading, but PDFs with huge margins or small font sizes don’t work well.
One way to fix the margins issue is to use the “Send to Kindle” feature, which converts PDFs to the Print Replica format and trims their margins in the process. Sideloaded PDFs actually appear with more margins (thus reduced font sizes) than books sent through Amazon’s servers.
It works fine I would say. In the absence of a bigger screen with proportional DPI (kindle scribe is 300 which is one of the highest in terms of screen size), kindle scribe is one of the better options still IMO.
One way to fix the margins issue is to use the “Send to Kindle” feature, which converts PDFs to the Print Replica format and trims their margins in the process. Sideloaded PDFs actually appear with more margins (thus reduced font sizes) than books sent through Amazon’s servers.