Import, Export, Backup
I like the user interface, easy to input new tasks, and easy to organize tasks into projects and subtasks. I would like to use Todoist.
I would need to import tasks, from the outline program and text files and emails I have.
I don't see any way to batch import a lot of tasks. Looks like I would have to enter each item individually.
I don't see any way to backup my data. This would be essential for me, since I have so much to keep track of. I've had companies go out of business, or found better solutions, and had to transfer my data. No Backup is a deal breaker for me, I can't use Todoist.
Backup would have to be in several formats, including CSV and XML, and include keeping subtasks linked to tasks, notes, tags, priority, dates -- all information.
So, I'll have to go with another program, probably Remember the Milk (has batch import, export, works with Google Gears so can use it offline. Can create tasks with contexts, folders, labels, estimated completion, and map locations all by typing into the quick-enter box)