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Flwm doesn't come with as many features or extras as other WMs. This makes it a lot easier to set up and understand.
Pro You can use windows not in the top stack
The user can click on a window and it will not raise, instead staying behind any other window. The user is then allowed to use the window, such as a terminal. It will remain below any other window until the title-bar is clicked.
Pro Window title bars maximize useable space
All windows title bars are placed sideways in order to maximize screen space.
Pro Small & fast
Flwm is a small, speedy footprint window manager that does not use up a lot of resources.
Con Lack of theme support
Flwm does not have any themes, so what you see is what you get - which is in fact rather dated looking.