One question I had about the Alien Bees reflector: does it allow you to change the angle of the umbrella without having to purchase any additional parts?
The umbrella mounts to the head. The shaft of the umbrella just inserts through a hole in the reflector to the hole with the screw that holds it in the head. When you change the angle of the head (tilt, pan) the umbrella follows, as part of the unit.