I actually bought the entire Death-Note series, along with the two live-action films, as a birthday gift for my 15-year old daughter. She had been a fan of anime for awhile, and had watched episodes of Death-Note on Youtube. I decided it was well worth buying the series, and actually told her I would be buying it for her birthday. However, she was genuinely surprised and pleased when she actually received the series. She was very impressed by the quality of the sound and animation, and enjoyed the extra features which included commentary and interviews witht the filmmakers and actors. The soundtrack includes the original Japanese soundtrack, English subtiltes, and an excellent English-dub track. Note: the subtitles and the English soundtrack do not match at all. I think this has a lot to do with the care that was taken to make sure that the lip movements of the animated and live-action actors matched with the dubbed-in words as closely as possible.
One other note: this series is best suited for teens and adults, just because of the complicated plot lines, as well as scenes of violence and some language.