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Pro Adds dual panes to the Mac finder
A great feature of TotalFinder is the ability to have dual panes. This is really handy for moving files around.
Pro Adds cut/paste context menu functionality to Finder
You can cut and paste with just the mouse.
Pro Copy path to file or directory feature
You can copy the path to a directory or file using the context menu in Finder, options include POSIX Path, URL, Windows Path, UNC Path, HFS Path, and Terminal Path.
Con Requires special installation procedure in El Capitan and later due to "System Integrity Protection"
"System Integrity Protection" (also know as "Rootless") is a feature introduced in El Capitan that, among other things, inhibits applications to inject code on system apps (TotalFinder injects code into Finder).
For TotalFinder to work properly one must disable SIP temporarly to install. After installation a user can turn SIP back on without issue.
Instructions are detailed here.