As a long time user of Wunderlist, this new replacement fails at the single most important thing next to holding taks: remind the user of said tasks. If a task comes up as due, I expect it to stay in notifications until I clear the task. Instead, To Do decided there's a time limit on how long a reminder stays on your notifications which means it isn't reminding you anymore which forces you to remember to open the app to see your tasks. This completely defeats the purpose of a reminder.