I also found Notebook to completely make stuff up.
Like I gave it 4 documents and asked which info appears on all 4 and it just made it up completely. I told it the answer was wrong, and it said 'sorry I made a mistake, here's the actual answer...', and that was also wrong.
Quite worrying as if it was a lot of data I wouldn't have been able to fact check it!
SO maybe also do some spot checks on the answers it gives.