As a web extension for Firefox or Chrome, I think this functionality is useful and an improvement over what the browsers provide out of the box. Bookmarked.
However, as a CLI tool, I don’t see the usefulness of this over a standard CLI tool like curl or wget. Can someone explain to me the latter?
I'm the author. Note that it's more powerful than wget or curl since it embeds resources (CSS, images, fonts...) in the saved page. Actually, you can consider it as an alternative to wkhtmltopdf [1] more than curl or wget. Running it on command line can help people to automate things, or use it on server-side in a SaaS, for example.