Update (3 hours after post was hunted)
Looks like Clear is rated super high on the Mac / iOS App Store. Giving it a try (and paying the $9.99 for the Mac app) for a Wunderlist alternative.
Clear on Mac App Store: https://itunes.apple.com/us/app/...
Clear on iPhone App Store: https://itunes.apple.com/us/app/...
I've used *countless* and I mean countless, copious amounts of to-do list apps, but I always come back to Clear. The intuitive UX just makes so much sense. Everything is perfected to the last detail, from the colors to the sound effects to the alerts. Added bonus (which may be the reason I keep going back): There's always a inspirational quote that helps you stay afloat on days when you have a lot of work.
VC Puzzle