I don't think I'm likely to find what Im looking for in the 0click box.

Every time I've used hnsearch, I've done so because I was looking for something VERY specific (that I think I remember from HN) and I usually need to go a page or two deep to find it (and/or I filter stories/comments and re-sort). HNSearch is a great tool and I use it a few times per week, but I don't think it fits the "0click" feature very well. Maybe it works better for other people though, and I'm the minority.

Out of curiosity, do you measure the performance of 0click box functions (including who clicks through for more info)? And have you ever dropped one because it underperforms?

Honestly, I prefer Google's implementation of site specific search better. I'd rather search with DuckDuckGo/Google's engine, because its better, rather than be redirected to a usually bad site search.