Not a GUI-based video editor. This would be used for batch video editing, or file conversion as it covers a lot of different file formats. I have a bunch of scripts using ffmpeg, but I wouldn't use it on its own for video editing if it was something like cutting and editing a bunch of videos together with transitions and whatnot.

This is my main video editor. The only reasons I use it, is it's free, it supports Linux as a first class citizen, and it has all the functionality I need for a decently edited video.