Sony Xperia devices have a Stamina mode that turns off data and wifi right after the screen is turned off. Big difference in battery life if one is not really interested in push notifications, etc.
Only drawback is that background downloads get canceled when the screen dies but i don't have any downloads outlasting my active usage sessions anyway so i don't care really. Many people wouldn't like missing the push notifications from the mailbox but for me that is just another good reason to activate it.