Although Devise tutorials are not officially reviewed, the most authoritative tutorial helpful for users is the official tutorial offered by the Plataformatec company on the Devise project's GitHub page, which has been starred by close to 13,900 users, as of October 2015. The Ruby on Rails boot camp Tealeaf Academy offers another reputable tutorial for using Devise.
The official Devise repository on GitHub has a detailed tutorial in its Read Me file that includes steps for getting started installing Devise; generating models, controllers and views; setting parameters and customizing Devise to meet an application's needs. There's also a way to contact the developer with problems using Devise.
Tealeaf Academy's Devise tutorial has similar components including sample code and commands to use. It also covers using Devise for different types of user accounts and setting up automated testing for the tool.