"As Paco points out, far too many people for far too long have used Bristol as their sole preparation for the exams."
Before the mud pies start flying

I was meaning "all databases", not singling out Bristol!
The answer is yes, it is as good as people say, but it is no substitute for learning - but you won't pass the exams without them. We've had some students who really knew their stuff try that and it didn't work!
Phil