I've played around with it for a bit, and will probably continue to do so - but my initial take on it is that it isn't very intuitive, especially compared to SourceTree. SourceTree has had some struggles lately with performance and bugs in their new 1.8.x version, but those aside, it does everything I need it to, and it was very intuitive to pick up. In contrast, the UI for GitKraken is just...odd.