Occasionally of course it's way off, in which case I have to tell it to stfu ("snooze").
Also it's great at presenting someone else's knowledge, as it doesn't actually know facts - just what token should come after a sequence of others. The other day I just pasted an error message from a system that I wasn't familiar with and it explained in detail what the problem was and how to solve it - brilliant, just what I wanted.
That’s probably the single most valuable aspect, for me.