For a paid app, the lack of basic core features (i.e. to simply view comments) indicates a lot of work needs to be done. The existing free readers out there are a bit more capable.

I ended up buying it since I'm still looking for a good HN reader out there that does all of: indenting comment threads, gives you the choice of browsing directly to the story without going through comments, and displaying key story information beside the story, such as the number of votes.