Not even for outdoor portraits? Also, should I still run with one on bracket one on stand? I've shot bounce before and I just feel the overhead light it would force me to work with is too unnatural. I was in a wedding last week and their photogs shot with a sphere on camera and one on stand an their lighting and images were looking amazing SOOC. They were also shooting 24-70 L and 70-200 L I believe which I clearly don't have.
Listen to the previous poster. Gary Fong's line of devices are gimmicks aimed at newbie photographers who want to take better pictures with their flash.
When Fong demonstrates the Lightsphere, as in the video below, he manipulates the shutter speed to allow more ambient light in on his Lightsphere example. It's basic knowledge that the flash output would not change the amount of ambient reaching the sensor in this instance.