Well, based on the other review on Amazon, as well as a couple more elsewhere, I purchased The Rock on DVD last week. It had been my favourite film for a good few years after watching it shortly after it's release. Good story, stong and convincing characters played by Connery, Cage and Harris and a generally great action packed film. I then noticed Amazon's 3 for 2 on selected BluRay discs. Well, I wasn't sure what to buy. But after watching The Rock again I decided I wanted to give it a go, and see if the difference really was poor. In the end, I'd say no. It's a great improvement on the DVD Much clearer visually and the sound is also much better. I'd recommend buying this on BluRay, as it's a fantastic film, and I believe there is a marked improvement on the DVD, which is now going to a friend.
I watched it on my 26" Sony Bravia KDL26P3020U - via my Playstation 3 (HDMI) set to 1080i (although at this size, there's no difference between 1080i and 720p)