I was looking at this on Reddit. I have a weird fetish for style guides for some reason. I want to eventually build one for my current site, just for the fun of it. It'd be an easy way to get some backlinks too, on list posts for style guides.
I'd only use this one to quickly categorize and figure out what information I wanted to present, then I'd make my own version. You're going to have a million companies out there with the exact format for style guides soon. Doing your own will be a way to stand out.
Everything is becoming so cookie cutter due to great tools like this. Just another opportunity for the real deal to stand out from the noise.