I must admit I usually immediately disregard any fancy new git tools, they come and go and often don't work right and create a gigantic mess.

But... have you seen who wrote this article?

Scott Chacon. If there's anyone in this world whose article would make me try a new git tool, it's him. He wrote the Pro Git book, Git Internals. Oh and cofounded GitHub. This is not argument from authority fallacy. This is "hey! this guy knows git like very very few others, it's worth listening to what he has to say".