The adoption of MATE is gaining momentum, as more distros add the desktop environment to their repositories. Using the original GNOME 2 code when GNOME 3 came out, the project has matured greatly over the past year or so, and is now even in the Fedora repos. The newest version of MATE, 1.6, has just been released.
This updated version comes with a long list of changes, but nothing like the laundry list of major fixes like in previous updates. Systemd-logind support has been added, Caja has had some minor tweaks, and functionality has been added to the panel.
Along with the update were quotes from the different distro developers, with their opinions on MATE. It’s a good read, and shows how positively the developers of Linux Mint, Salix, Sabayon, and more, think of MATE.
You can check the MATE wiki on how to get MATE for your distro.