They definitely need some js error tracking tool (like qbaka.net) to handle errors. Their main javascript size is 420K!
My only beef with the WP7 version is that the increases in integration with online content have at times disrupted fluidity by delaying loading of portions of the app.
It is great to see HN finally giving the project some deserved attention. Previous submissions regarding the project have fallen flat.
Thanks and keep up the good work.