Instruct: Classify a given review as either positive or negative.
Query: Brilliant, though sometimes a rehash or older material

This BBC documentary is as impressive visually as ever, and if you haven't seen Planet Earth or The Blue Planet, it'll definitely wow you. However, there's not that much new in here, though there is a greater effort spent in linking the event to how it affects the different species. Would have liked to see new events, such as the butterfly migration in America; right now, it mostly comes across as material that's been done before. Still visually stunning, but not particularly new.