Planet Earth set was excellent but Blue Planet Seas of Life set had some problems. Special Collector's Edition was a disappointment because 2 of the DVDs were defective; so, I sent them back for a replacement. The replacement set now had 3 defective DVD's (unreadable). Amazon did very well in replacing the set, but people in charge of quality control had to be "out to lunch". I was forced to ask for a refund.