CANON BG-E3 BATTERY GRIP
Canon BG-E3 Battery Grip
Battery grips are great for professionals as well as amateur photographers who want to feel and look like a pro. I say that tongue-in-cheek because whenever you have specialized equipment in your hands it changes the way others look at you.
When I am using equipment that separates me from the average point-and-shoot toting photographer, it invokes a visual and emotional impression on the people that hire me.
Although point and shoot cameras have evolved to a great extent, there are performance based advantages that come along with using a DSLR and a battery grip.