I've been working with it heavily since its first release. I use it for software architects, complex debugging and some development and I have not had it refuse or downgrade even once.
That said, I've got it easy. My colleagues who are chemists and biologists can't even ask one question. There are so many triggers in their memories and workspaces they can't even ask a non-triggering question. And we all work in medical diagnostics, it's not like we're doing anything remotely nefarious. Fable could be such a benefit, but the limitations make it worthless.
For example if it knows you do X at Y company is it more or less strict?