Rated 4 out of 5 stars
Worked great from the get-go (TB3). Well made.
I would give it 5 stars if it offered one more adjustment to the alert panel - the option to reposition it - in 'sticky' fashion - where I choose. I need to see the alert from across the room and at the bottom-right of my monitor is not ideal.
(I used to use a third party add-on for new mail alerts, but it won't work with TB3.)