I have been teaching my students to use Viviti for blogging since last semester. Until now the feedback is quite positive on the functionality and navigation.
Thanks for Jerrett, a very responsive developer and their teammates (You can find a very innovative pic of them in the Viviti blog!), they answered members’ questions all the time. For example, some of my students forgot to select a plan after the 15-day trial period and cannot sign in the accounts, the team fixed the issues within a couple of days upon requests!
By the way, Viviti is a very stable (never experience a down time till now) and fast system (provided that you have a stable Internet connection) incorporating with many Web 2.0 features like easy embedding YouTube, Twitters and Google Map. Although the user interface (UI) is designed in English, the most delighted feature to my teaching is that it supports Traditional and Simplified Chinese characters which facilitates my students to blog everywhere with an Internet connection.
Be reminded that the system is more compatible with Firefox with Adobe Player.