I already owned this set on DVD but I wanted to experience the amazing quality of Blu Ray and oh boy I was not disappointed. The picture is absolutely astonishing on my 40" 1080p HD TV, every little detail looks stunning, you can see every tiny bead of sweat every line on someones face and scenery especially looks phenomenal. I have absolutely no complaints about the quality of these discs.
The cases are not full size Blu Ray boxes, they are slimmer than usual and the X Men Origins Wolverine case is even smaller than the other three films. This does not bother me in the slightest as it preserves more room in my DVD rack.
Lot's of extras on the discs although I have not watched them yet, there is various interviews with the cast, audio commentary and more.
Overall if you are a fan of the Marvel Comics or just a fan of Super Hero movies in general then this is definitely one worth adding to your collection and having it in Blu Ray is just that much better!