I have run some of the other Marathon Majors and Chicago leads the pack in terms of organization, volunteers, crowds, security and course. Similar to Berlin, this is a fast course. The lack of hills actually is a negative as a fast runner needs to have other muscles activated during a race and this one beats the same muscles up. Most will think its a dream course, but flat is not always ideal. New runners will feel it tomorrow and understand what I am saying! Otherwise, a great race experience in a terrific city.