Just tried it and after testing almost every option on the app store, this is by far and away my favourite HN Client - I wish they were on the Alienblue team.
The menus are intuitive, bookmarking is a god-send (Would love to be able to export this though)
A theme with the traditional HN colouring would be brilliant as it's really grown on me but the default theme isn't far off.
I have no real complaints. If I was nit-picking, I would say the section titles (Top stories/New Stories/Show/Ask/etc) are a little too close to the iOS status bar and sometimes my finger was registering on the status bar instead of the category and as a result, not registering my touch.
Apple Watch support might be nice, if you can get it right - Notifications for top stories (Like what Pushbullet does for the HN channel) and the ability to scroll through posts and comments. Not for everyone, though.
Love it!