I'm considering purchasing one of these to do some on-location portraits. What size do people find most convenient? I'm thinking about either the 5x7 or the 6x7.
I've been using a 6X7 and it has worked out well. I always seem to want more space so I don't think I would be as happy with the 5X7. As an example, I can shoot a small group easier with the box on it's 7' side and still have 6' height to work with. The 6X7 is still manageable in size for transport. I think anything bigger could be a bit much. In the studio, mine stays up most of the time. I use it as much as a big reflector, a cutter and even as a quick black or white unlighted background. From time to time, I've used it as a poor man's overhead light bank. It's lightweight, stable and easy to position. It slides around very easily. It's really is a versatile lighting tool.
Depends how much of the surface you need to use. Even with two lights you don't get "perfectly" even coverage over the entire surface, but it still does a great job. I often get by with just one light because I don't always use the entire surface. But two lights will definitely help to even coverage and keep level's where spill can be more easily controlled.
