http://hn.premii.com is absolutely mind blowing — it's lightweight, web based and super fast.

The functionality of Hack Later is its speed and deep read later (currently Pocket only) integration. Comments are in the works, too! Also, I'm probably biased but I think it's pretty good looking :)

When you click a link from one of the app's inbuilt views to the story page or the Hacker News comment thread, you don't have a "back" button, and I can't find any way other than force-quit-and-restart to get out of it.

(It'd also be nice if, at least on iPhone, the app could produce the same effect as <meta name="viewport" content="width=device-width" /> when viewing external pages; as it is now, such viewing involves lots of tiny text and scrolling, without the Safari reader interface available to mitigate.)

Nice app; I look forward to using it, once the navigation's fixed.