I've used "read later" type services since around 2008. I used Instapaper for a long time and moved on to Pocket about a year ago. I've had a Pinboard account for a few years, but I never really found a use for it. I store articles in Evernote when I want to save them forever. I like the app for Pocket, but I don't like the branded URL when sharing to Twitter.
I asked on Twitter why someone hasn't built an app on top of Pinboard as a Pocket/Instapaper replacement. 3 minutes later, I had my answer. Someone had. While Paperback doesn't have an iOS app, it has really nice web interface (responsive design). The developer mentioned to me that he is working on an iOS app. It's $15/year, but I am really enjoying it so far. If you are looking for more control over your bookmarks and your "read later" experience, I'd highly recommend looking at Pinboard and Paperback. Don't forget to check out the new article over at The Sweet Setup on discovering the best Pinboard app for iOS.