I remembered the excitement of the original and it's cutting edge effects.
Technology and effects have moved on, as evidenced by the new Tron, but great ideas remain great ideas no matter their age. Watched these back to back and even the blue-ray treatment can't disguise the age of the original. The picture is clear but the effects are fuzzy, but this doesn't detract from the story.
The extras are informative and demonstrate just how ground breaking the original was. But I tend to buy for the films, not the extras, and these films do not let you down.