The amazon ones are truly amazing. I have wondered for years who is answering those. I had thought that questions were routed to previous buyers somehow, but that's never happened for me...
Well I was going through and approving the reviews (just for stopping spam reviews), and I found a guy leaving a review explaining that he's very sorry but he hasn't had time to use the product as his wife has come down with a bad case of the shingles - I seem to remember he went into quite a lot of detail and obviously hadn't realised this review could have been made public.