Ok I will be the first one to disagree with the faster game speeds.
While the faster game speed appears to have some advantages - one being that you get to see the results of your decisions implemented sooner (which is probably what everyone posting to date likes) it has a major drawback - being that it is makes the sim very time consuming if you want to keep up with the pack.
Faster game speeds may be better suited for people that are in a position to 'monitor' the game closer e.g. run the sim in the background while at work, but I don't believe that it is suited to the players that log on 2-3 times per day to check progress and make changes, etc.
Edit - but i am eagerly waiting for the 70+ year longer game...that will be interesting...imagine 6-7 planes refreshes being required in the one game.