I'm what I would consider a heavy user. I regularly stream music over soundcloud, browse the Web simultaneously and have all my notifications set to push. It's not uncommon for me to receive up to 80 texts and respond to almost all of them. I do have power saver enabled and the new snapdragon battery guru with a few other constantly running background apps like ABP and power toggles.
Between 3 emails, Facebook, youtube, and all of the above I can kill the battery in 6-8 hours. That said if I'm busy at work my battery will easily last more than the entire day.
Never forget before buying a phone Motorola breaks their promise of updates.