Love it, using it in my day to day work :)
Feedback:
Privacy blur applies to the collection, unless you have it enabled and then add an item. Then you find yourself in a situation where all but the new item are blurred.. and if you toggle again.. all items are shown except for the new item, and there is no way to undo this other than deleting and starting again.
I do like the idea of privacy for a single item in a collection though.
Update: If the collection is toggled to private, and you edit an entry, that item is no longer blurred, but all others are.