I used to use the little clip-on CV meter, which was a gem, on my M3. Very accurate and small. Many times, though, I just kept it in my pocket and pointed it at the scene to take a reading. After a while, I used basically used the meter just to as a backup to check the light and relied primarily on the sunny sixteen method. Do it for a while and you'll amaze yourself at how accurate you become at guaging the light. Do you shoot mostly color or black and white? If you shoot slides stick with the meter. If you shoot black and white try the sunny sixteen method and use the meter as a backup.