I couldn't get it to recognize my microphone but I didn't fiddle with that much. It was easy to capture an audio track on my Mac while recording the screen on the Pi and bring the movie over into Quicktime and sync them up.
I've been looking for a way to record the screen on my Pi so I thank you too!
More recently I moved over to OBS, which I consider to be far superior to Quicktime for one important reason: more control over audio settings. With OBS I can use just about any mic and get reasonable sound quality with a few tweaks. At present, I'm using a $20 headset and it works just fine.
https://i.imgur.com/qOQIWoi.png
records in MPEG or GIF and lots of screenshot options as well. auto-upload to lots of free sharing sites if you choose. for screenshots I use Windows10 built-in "snipping tool" you dont get any simpler than that.
For Windows: Camtasia
For macOS: Screenflow