Ranked in these QuestionsQuestion Ranking
Pro Mouse-free interface
It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
Since it's inside vim, it's very lightweight and fast. It fires up quickly and it does all operations painlessly.
Pro Helpful to people who work a lot inside the terminal
Using command-line tools (vim/git) keep you stick in the terminal.
Con Not for people who are not used to vim
Since this is basically a vim feature, it's clear that people who aren't used to vim and it's keyboard-based interface would find it very hard to work with vimdiff.