Completed tasks on iOS is great but extra row on project is distracting !!
The completed tasks is great to have to iOS but currently the option is accesible by an extra row in the current project listing which is quite distracting for a todo app.
Instead of reading tasks we end up always reading this "Completed tasks" text and having to ignore it (mentally draining our resources)... what I have loved about TD is the simplicity...
IMHO you should replace the cute person sharing icon at the top with one of "Options" and have both "Sharing" and "Completed Tasks" under there instead of polluting the main interface.