I found it exceedingly dumb. I asked it a series of questions about audio transformers during which it recommended a book on audio transformers by Bill Whitlock. it even gave the ISBN number. I looked it up but the ISBN it had given me was for a completely different book - not even about transformers. So I told it this. it apologised and gave me a different ISBN. Long story short I did this about 10 times and each time it gave yet another wrong ISBN number. II tried once more and also asked it if it was absolutely sure this was the correct ISBN number and and it confirmed that it was but it still gave the ISBN of an unrelated book.
Not in the least impressive.
Annoying isn't it?
The problem isthat ISBN codes get recycled once the original book is out of print.
My personal pet-peeve with internet info is that sometimes the date isn't correct, or completely missing. And that's a big hurdle for AI.