No I haven't because it is $3 and I don't want to spend "so much money" for an app, I might not end up using (just like all the other 1000 Hacker News apps that are out there). I might give it a shot, though, if you say it's worth the money.
IMHO it's the best HN client right now. It has some minor UI awkwardness (specifically, how you switch between the main UI and the "web view"), but nothing terrible. With things like thread collapsing and read tracking, it's definitely better than HN in a browser.
