Whenever a new device comes out, we look for the killer feature that justifies its existence among a crowded field of competitors. Not every device rises to the challenge. Even the iPhone 5 has features that either match or fall short of its (largely Samsung-sourced) competition. Samsung appears to take great pleasure in pointing this out in ads.
Well, the new BlackBerry 10 phones do have a killer feature. We tend to take it for granted, but it is likely the most undervalued killer feature in smartphones today: It has potentially unlimited battery life.