Between the simple, clean layout, ease of use, and useful ability to easily snooze tasks to later, no other free to-do app has come close for me! However, I do wish there were more options for repeat scheduling, such as once every two days/weeks/etc, and to set a repeating task for multiple days a week (ie just Monday and Wednesday, etc) without having to make two or more separate tasks for the same thing, and itd be nice if you could schedule a task when you make it rather than having it automatically set to the time you make it, but thats a small thing.
Sage of the Rose about Swipes - To do & Task list. Plan & Achieve goals., v2.8