I like it a lot so far, but auto-check of the parent task would be great!
For items with subtasks, auto-check of the parent task when all the child items are done would be ideal, considering the 'paged' view for sublists. This way (obviously) you can see which items are fully complete in the main list without double-checking.
Jonathan Bright commented
This is already implemented
And if a sub task gets unchecked also unchecked all parent tasks