I tried to use To Do this summer and gave up after a few weeks. Across Windows and iOS: notifications mostly don’t fire, apps kept reloading content every time I opened them (aka no cloud = no functionality). In the end, I gave up and just resumed using a combo of Reminders and Notes.
I had a similar experience, but without the Windows element.
I paid for Wunderlist, but dropped it because it evolved into something more convoluted than I wanted. I went back to the stock iOS apps.
I didn't even know what Microsoft ate Wunderlist. I guess that's why I got an e-mail about Wunderlist out of the blue after I hadn't used it in what seemed like years.
