Personally, I find the entire experience to be incredibly slow. Loading the front page takes multiple seconds, there is a noticeable delay between tapping a link and any form of response, and back navigations are often unexpectedly slow.

Non-SPA related, I also think that many of the touch targets are too small, or work in unexpected ways. Tapping a username collapses a comment, even though there's an arrow next to it. Tapping an image associated with a link doesn't follow the link, it expands the image (even if it is an article link). Tapping the title takes you to the comments, not the article. The only way to get to the content is to click the itty bitty domain title beneath the title. All of these behaviors are different than how the desktop view behaves. For a site that calls itself the front page of the internet, it's getting harder and harder to get to actual content.