For me, Wunderlist is well done in offline access, super fast sync and a battery-friendly Mac app. I sometimes work in some place that does not allow internet connection, e.g. warehouse where phone signal is screwed, or some meeting rooms just block the signal due to their privacy.
In many years I still cannot find an alternative. May be Evernote(?)
And me too. Meteor becomes my most favourite development framework in 2016. The ability of offline and data sync are some-kind of "by default" once I start a project, or just a simple test on idea.
Plus, packing it into a desktop app is lightening fast. It is a "wow" factor for potential clients.
Edit: Attach an image to explain why: https://twitter.com/Edditoria/status/1043481201443368960