More info on completed tasks and toggle completed visibility in 7 day view
I really like the completed task feature and how it tells you when you completed a task, but it doesn't show when the task was due or the priority level of the task. I think this is important to see. It does however show the notes. Maybe a option in the preferences could allow you to choose how much information is visible on this screen.
A separate but related suggestion is that you should be able to toggle on and off viewing completed tasks in grey on the main today and 7days pages. Since it already shows the last 5 days at the top of the screen when you have overdue tasks, it would be nice to be able to see what you did get done those days at a quick glance without leaving the main page. It would also be nice because it would display them in the same order that they were originally listed.