I have the 13.3 inch Digital Paper but not the ReMarkable. The A4 size is great for reading Magazines and Journals. The writing experience is good but the stylus does not support pressure sensitivity. One feature that stands out: split screen, i.e. one side as a reader and the other side for taking note. By the way, the stylus supports erasing and highlighting.
I wish it supports EPUB (PDF-only reader). Was interested in getting a ReMarkable, but the A4 size won me over.