I just subscribed. Very nice and simple service, love it. The only bad thing I can say is that the "popular" tab seems to be HN delayed by half a week or so.
I've been a very happy user of Pinboard for the last few years (ever since Delicious got super slow).
I even subscribe to the archive feature, although I have no illusion that I will get around to reading all my 20k bookmarks again...
It seems Pocket(which recently started using their extension to politely spam Chrome start page with article suggestions) and Instapaper are in some sort of war of attrition while pinboard is happily chugging along.
My complaint about the popular feed is that it's mostly tweets and Pinboard doesn't name Twitter links anything useful. It would be awesome (for the popular tab and for my own Twitter bookmarks) if Pinboard would use the text of a tweet as the bookmark title.