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.
Never on outdoor anything. Especially not outdoors. They dont work. Lots of people use them, they just dont realize they arent helping. Really do a search here using Fong, the results should dissuade you from buying this snake oil device. If you can use a stand, then get a large source like a shoot through umbrella or softligther or something that actually increases the light size.