SpecsUpdate
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Pros
Pro Does not depend on toolkits
The desktop works without Systemd, ConsoleKit, PolicyKit or even D-Bus.
Pro OpenSource with no copyrights
The whole desktop is licensed under 3-clause BSD license which gives you complete freedom for any reuse
Pro Lightweight
It's fast and responsive.
Pro No dconf or gconf
All desktop configuration files are simple plain-text files on the back-end.
Pro Filemanager Insight fully supports ZFS
As it was initially developed for BSD-systems its file manager "Insight" supports the advanced ZFS features other Unix file managers misses.
Pro Qt-based
A Qt-based desktop.
Pro Modular
Since there are no toolkits all applications are just GUIs to common *NIX applications.
Pro Easy to configure
Pro Completely customizable
Cons
Con Poor support by distributors
It is unavailable from the most distributions so you have to build it from source.
Con Not really beautiful
Functionality comes first.
Con Unthemeable for usual users
As all Qt desktop environments themeing is hard since you need to know C++. There is a workaround using qss, however, it's not as powerful as GTK/CSS, Enlightenment or Windows theming.