So far, the service has been fantastic, and I am trying out the new mail.tutanota.com client and it's working great for me. The searching is cool and I tried the password recovery strategy and I am happy.
However, as a free user, I am quite annoyed by the incessant advertisement of the premium features. I am still a student and I am willing to support Tutanota in the future, but please tone down the propaganda right in my mailbox right now.
Please be gentle with your free users.