Brilliant? Possibly, yes for those who didn't do enough work to find the answer to one of the really tricky questions.
Definitely not brilliant for those who did the hard work and eventually found the answer by themselves!
Oh and please I'm not the police as many seem to think - I'm just someone who likes to do the hard work themselves and use my own answers, not take someone else's answer. Perhaps someone can explain the satisfaction they get from using someone else's answer?