UbuntuMATE is looking solid in it’s Beta 1 release. I’m currently installing XCOM: Enemy Unknown to see if works as well as it does in Ubuntu.

CentOS 7 My first attempt using this distribution and the first release after being absorbed by Red Hat.

Key Features
Up to 10 years of Security Updates
Gnome 3.8.4 (with a classic inspired panel)
Hardware support updates every 6 months

Intended to be used as a Community Enterprise Distribution where stability is more important than having the latest technologies.

My at a glance opinion is that CentOS is positioned well between Debian Stable and Ubuntu LTS for the packages it offers.

Like Fedora only free software is offered upon installation and as of right now there is no non free repositories available but they’ll show up pretty soon.