I think the whole thought of it is a brilliant idea but there is one problem with it! It’s designed to keep metal out of the heart. Thats the solution to Tony Stark’s problem and the start to a new problem. The thing is, is that if it is designed to keep the metal shrapnel out of his heart its also going to keep the iron in his blood away from his heart and creating the problem of the iron clogging his veins and arteries. Now this doesn’t mean that I didn’t like the movie because I did like it very much so. I just think that there should be some kinda of a side story line to Ironman 2 with the fact that the arc reactor is not only keeping Tony from dying fast but also it’s killing him slowly.