Recs.
Updated
SpecsUpdate
Pros
Pro Havn't found a WM that beats e16 in 20 years.
I've been using e16 for about 20 years and tried quite some other WMs, but always returned back to e16. It's fast, doesn't use much resources, is highly customizable and is rock solid (I cannot remember it crashing). It's combination of simplicity and beauty is unmatched.
The default theme on e16 is kinda disappointing. Try B-42 or Dark-One.
Be careful if you enable Composite. It works flawless, but you can screw your menus when playing around with the transparent settings in the settings menu. Making a backup-copy of your .e16 preferences beforehand might save you some trouble.
Pro Lots of themes available
There is a large selection of themes available for the Enlightenment window manager, meaning that customization to one's preference is very straight-forward.
Cons
Con Lacks utilities and app integration
Apart from very few bundled apps, unlike Gnome or KDE, Enlightenment does not ship (or barely) with any utilities that actually characterizes the basic difference between window managers and actual desktop environment. Both KDE and Gnome, for instance, provide fully integrated archive managers, file managers, PDF viewers, disk burners, audio player, and every kinda tiny app that integrates well with the desktop and provides for a integrated experience.
Con Bizarre underlying code and documentation
Currently, there is no manpage for Enlightenment. This is a bit bizarre. The site for Enlightenment has barely any documentation, citing a rather large change to the underlying system. Which is also strange, as this notice has been up for over a year. Stranger still, is that when invoking certain functions invalidly, rather than something helpful like, "Wrong function", it'll say things like "Spank Spank! Bad programmer!"
Con Minimal set of utilities
Enlightenment only comes with the bare essentials, meaning there is little that can be done upon first install in comparison to other more fully featured desktops. This does, however, leave all the customization of what apps to install up to the user, which may be a plus to some and is directly comparable to most other bare bones Window managers.
Con Sub-menu does not change direction when out of space
When you right-click for the menu in the right part of the screen but there is insufficient space for the cascading menu, you have to interrupt your selecting and move your pointer to touch the right edge of your screen - this manually moves the menu over to the left a little bit, so it has space. If there is a sub-menu, you have to once again move your pointer to the extreme right edge of the screen, for it to move over - and so on, for each level of sub-menu.
Every other OS and app/program in the world today, simply changes direction to where the sub-menus cascade. Whether that be upwards because it's too close to the bottom (we see this in the selection menus in our browsers in forms, or to change sides as we are accustomed to in all programs). This is logical, universal, expected behavior. But not in e17.