With camstudio it adds "freerecorders.com" in blue text into the bottom right corner of your video, it's very anoying when you want to make professional videos.
-It can only record the sounds picked up by your laptopmicrophone; no option to record the system audio with an external device.
-I also got poor framerate when I tried recording with the default settings.
-It doesn't capture your full screen, when you extend the box, you can't select your windows toolbar. That's very anoying when you want to use it in a tutorial. You can fix it by placing your windows taskbar at the left or right of your window.
This is my solution, use VLC as screen capture software, you can choose your audio recording and it solves all the others problems. Watch the video to see how it works:
https://www.youtube.com/watch?v=yuOBd9c-Dd0