Rated 3 out of 5 stars
It does work with some pages (including e.g. this one) but fails on others and then it only saves the visible portion. (No, I'm not talking about dynamically loading pages like the FB news feed.)
Might be related to some rendering optimization in the browser, may have worked earlier, but as of now it's unreliable. Actually it does the same as the screenshot node in the developer tools, so doesn't have too much added value for the occasional user.