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Pros
Pro Easily user-configurable
Pro Many available themes
Hundreds of themes.
Pro Excellent documentation, easy-to-find/understand
Pro Mature software
Cons
Con Might not work well with distributions that are based on more recent packages
This is a display manager forked from GDM2 by the Linux Mint developers. So the display manager is developed alongside Linux Mint, and since Linux Mint is based on the latest Ubuntu LTS it might not work well with distributions that are based on more recent packages.