Free - GPL v2
Ranked in these QuestionsQuestion Ranking
Pro Fast GUI
Responsive even with thousands of files or large binary like files
Pro Visual commit mode
Allows for interactive staging of files or hunks and deleting of unstaged or non-git tracked files. Hunk size slider allows staging/unstaging individual lines, letting you stage pieces of a file easily.
Pro Understandable trees (branches etc.)
The visualisation of the development trees makes git a lot more useful. The command line is good for a lot, but trees are for GUI clients like GitX.
Con Clumsy staging workflow
The staging workflow in GitX-dev is kind of clumsy and unintuitive.