Supposedly the early change this year will help show any real benefits/detractions to it. If you know how much you spent last year at this time, it should be different from what you spent this year on expenses. If it is the same, there is no real reason to be for it.
Myself, I'm guessing things won't be that much different. Hard to say for sure, though. I did like a study I read once that was trying to show the effect of losing sleep on driving. They used the timezone change to show when everyone had lost/gained an hours sleep for the week. Evidently the evidence was pretty strong showing that that extra hour made a noticeable impact on driving.