Hmm, I just tried it for the first time yesterday, and was actually quite impressed. I made a screen recoding of a desktop app, with me talking over it the whole time. The quality of both video and audio was good, and the file size was something like 5-10MB.

I can't believe I've been using Windows 10 for so long and didn't even know about this - I kind of wish they'd change the name TBH; would also make it seem more reasonable to be installed be default on Enterprise eds!