I have probed it at varying levels of depth in my domain and found it to answer at least as good as an entry-level engineer. This could easily be improved with extended training data. The problem is that when it begins to get things very wrong (or leave out important details), it would be difficult for an inexperienced user to determine that since ChatGPT responds so confidently to every query.
It will be interesting to see how this all plays out.
Presumably for it to reply with its standard "I'm a LLM from OpenAI and don't have access to the internet" instead of "Just use this thing that doesn't exist", followed with "Here's more info on this thing I've totally not made up" and finishes up with "Here's the references that I've just made up to explain the other thing I've just made up". Before finally saying "You got me, I made that stuff up".
Using it as-is to support humans is probably going to work well, using it as-is to replace humans is going to lead to some issues.