I've only seen the Blue Man Group in Boston and Orlando. I'm assuming the Boston show is the exact same as Chicago. The revamped show in Orlando has about 45 minutes new material. What I enjoyed is they kept all the old bits I really liked (like the marshmallow bit) and added in a bunch of really innovative segments as well. The major difference is a complete different ending. I have to say I miss the old ending, but I loved it so much I may be too biased to be objective about the new ending. New ending is a lot of fun but I felt the old ending was unforgettable.