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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 Small & fast
Flwm is a small, speedy footprint window manager that does not use up a lot of resources.
Pro Window title bars maximize useable space
All windows title bars are placed sideways in order to maximize screen space.
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.