i use three speedlights.. so far.
as Jim said.. you cant beat portable studio.. go anywhere anytime.
all three with cactus V4's, camera, and 3 lenses fit in my bag.
super easy to get around.. up hills and whatnot
sorry.. couldnt help myself
if you have people spare.. get them to hold the flash instead of mucking around with stands.. then you cn get them to move around a little too without moving.. great when you only have a minute or two during a sunset