Update version 1.8 improves the writing experience, giving the pens and brushes a more natural feel, and they also improved the reading experience by providing better text and image layout.
Last year the 1.5 update added table of contents support and the ability to search documents.
Here’s more about the reading improvements with the 1.8 update from the Remarkable blog:
We’ve made some significant improvements in how ebooks are displayed. In short, your documents will look better and load faster while giving you a better reading experience.
This is particularly evident in ebooks with custom text settings and images. Note that you might not see the improvements before you change the text settings or re-import your ebook.