I've been out the android game for a sec, but have you noticed any leaps in battery life technology?
My main beef was when I had a droid x it kicked ass, then slowly turned to shit over the year(s). While my iphone, is still as fast as the day I got it.
I think only way I'd move back is if the battery life was far superior, and I could keep a phone for a few years, and it hold its performance.