Greate I have Cobalt and don't need to install hude amount of extensions to have many fucntions on my site because Cobalt can do everything
Ease of use
First you need some time to get how Cobalt works but then you can guess that you can do everything with it.
Support is via forum where you get answers from developer or other members. I get answers mostly within 24 hours and am sattisfied with them
It's on Eng and Rus, some of items which are on Rus are not on Eng, but for luckily I know both, would be good to have more simplified docs.