The update is 300MB in size and brings some improvements like Project Butter or Beurre as they say in France. That makes the phone run smoothly. The update also brings to the phone personal assistant Google Now, which sends out timely information that you need to know, when you need to know it. It's like having a personal assistant giving you traffic information before you leave for the office, or your own personal meteorologist giving you the daily weather forecast so you can decide whether or not to bring an umbrella to work.
The Motorola DROID RAZR M runs Android 4.1.1 and both models have the same 4.3 inch edge-to-edge screen.