I would have to use it seriously to comment on features and such, but going to your website I found it took far too long to get to the demo and get an idea of the system.

It's odd that the download arrow is a link, but all the icons to the right (which follow the exact same style) aren't clickable. These could perhaps function as tabs, giving you extra feature lists for each category.

Also, need screenshots. I should be able to get to some screenshots within two clicks for any CMS website. Not even your about page has screenshots! Seriously, jazz this up a bit. You talk about UI, and don't even show any of it off.