Planet Earth is very interesting. I purchased the Blu-Ray Disc format. This version excludes the extras that can be found on the DVD version. This was quite disappointing as I had purchased this as a gift for someone who had watched portions on DVD. I would not recommend the Blu-Ray Disc format to a friend because of this ommission. I would, however recommend the purchase in other formats. I only gave it three stars on suitablility for all ages because I feel that children might be disturbed to see the natural process of predator and prey, which appears throughout.