It's an SPA and I do think it's a refreshing take on HN. Much faster loading feel. Don't know if I would use it as my HN front end - why not just make it a separate system altogether?
Faster loading? HN pages are so fast I sometimes wonder if my click missed the "refresh" button. This one has time to display two loading states, and the HN main page loads long before this thing's first loading state's done. This takes at least a full second before content shows up.