I've just started learning how to use it and it's blown my mind how bloody useful it is, while also being open source. I've got it set up to record part of my screen and my webcam at the same time, and then I can chop it up in post using Resolve, no problem.

Until I found OBS I was basically trying to record my screen and then narrate over it after the fact, but it just didn't jibe with me as there's basically no room for improv or failure at that point. And I personally prefer to leave my less egregious mistakes in the final cut to demonstrate that you don't always get things right the first time.