And the more you pay, the sooner AT&T will allow you to upgrade. I simply added the 1500 SMS plan and it moved my upgrade date from 3/2011 to 11/2010. I'm gonna eventually up the minute plan so that I can upgrade this summer.
It is POTENTIALLY worth it... Set up your A List if your plan allows. Wait a month or two and check how much your usage drops. In my situation, I dropped my 3000 minute grandfathered plan which was $126 a month down to a 1400 minute plan at $72 bucks.. $600+ bucks in my pocktet at the end of the year... Don't listen to some of these people who don't think things through. Try it... it may save you some cash.