I own both formats and have viewed more movies on both than I probably should!!! I have to date been more impressed with my movies on hd dvd for picture and audio quality until I Robot, I enjoyed the movie when it came out and took the opportunity to rent the BD release and all I can say is WOW!!! the picture quality is on par with the top tier releases I have viewed! The audio (dts master) is possibly the best I have experienced, clear, crisp, lifelike surround which combined with the picture quality and to me an excellent story makes this overall experience an A+++++! If you are a fan of sci-fi this is a must have for your HD collection!