While I'm new to HD DVD's, from the few I've seen, I'm very impressed with this set. Going from the first 2 movies seen so far, the graphics are VERY crisp and clear, so much though that sometimes you can see the difference between live actors and the CGI sets, something more blurred out from the less sharp DVD's.
The sound is great, after watching 'Phantom of the Opera' by ALW, I was a little disappointed in its sound, and was hoping that the HP set was not as bad, and I was happy to find that the sound was great!
Extras, the three plus hours of extras on the bonus DVD is nice, there's a card set that's like the cards in the 'Chocolate Frogs' which comes in the envelope invitation to Hogwarts in the first movie. A very impressive bookmarker set within with a flying broom letter opener, three bookmarker in the shape of a owl, seeker ball and the snake symbol from the second movie as well as a Gryffindor badge. All in steel and would I think cost a bit if sold separately.
It all comes in a nice box that's shaped like Harry's trunk, everything nicely packaged and sweet. As for the price, if your want all five movies you're already looking at $130+ for the HD versions, so if you can afford it, this is a cheaper way to go and one of the better Limited Edition Box Set's as I've seen, whether it's HD, regular DVD's or VHS.