Deploys a beautiful, responsive Coming Soon or Down for Maintenance page for your site. Collect emails, change styles, show social links and more
Yes you can, just make sure you are running WordPress 3.3 or higher.
Nope, it works on any type of WordPress install.
Yes, there is a checkbox in the General Settings area which allows you to hide the Obox badge.
Yep, you can even set the security levels of who can view the front end while logged in. This can be set in under the General settings tab.