TBH I mostly just lurk there and use it as a feed of interesting things when my need for procrastination exceeds what even HN has to offer. It's surfaced some nice stories though, that I didn't see on HN.
From what limited view I've had into the community, the quality of the discussion seems similar to HN. With a lot less volume, of course.
Maybe I'm missing something about the format. Do you feel that there's a sense of community and discussion? Or is it mostly a feed of interesting things?