I am always nervous about sequels, but boy did this deliver.
The story builds on the original film whilst maintaining the humour and energy that was delivered with the original film.
Robert Downey Jr does a superb job of developing the Tony Stark character, whilst Don Cheadle and Mickey Rourke help elevate this film above the pedestrian!
I won't go into the story as many reviews deal with that, but let's cover the blu-ray disc. The picture quality is superb and the level of detail is very high, it's easy to forget that you are watching special effects. The sound was superb and really tested my home cinema system.
And as for the digital copy, this is good quality too, and when watched on my iPad looked very good.
I think the combination of blu-Ray, DVD and digital copy makes this disc set pretty good value.
All in all, if you enjoyed the first film or are a Marvel comics fan then I recommend you give this a go.