I put in a moderately specialist topic I'm reasonably expert in. What it wrote was highly convincing. While I wouldn't be particularly impressed, I absolutely couldn't distinguish it from a mediocre human. It's really quite terrifying to think of the internet filling up with this garbage.

Is it garbage if it writes better than most of the humans from the developing world that are currently exploited to churn out meaningless blog spam?

Also, it would have worked perfectly for my girl's homework assignment, but she has morals and decided she couldn't ethically submit it. She did use the output for ideas on what to write, though.

It writes very convincing pop-sci articles about high energy photons and the like. I see no way how even a proper AI can distinguish it from similar articles written by journalists.