More people need to cancel that are ahead of me, I ordered the first day so this doesn't help me much.
Anyway, I can see canceling an order because something new comes out (ipad) and you think it would be better for you. It would be like pre-ordering a horse and then the model T comes out, the horse will be broke(ride-able) in 2 more months but you have the money might as well get the car. I think this is a good analogy since horses were better than the first cars, but I'm not good at analogies in general.