the MagBounce is by far the best Bouncer out on the market for mobile usage, and I have tested a view.
Though using the bouncer eats a lot of energy for your flash, the result on ETTL usage is outstanding. Best skin tones often acchieved when giving your flash -2/3 intensity. Both the wide opening and the soft turn spread the light in a very harmonic way, illuminating both portraits and group pictures or full body frames in the same, even way.
You can see an example here:
Conclusion: The MagBounce is probably the best way to spend 50 bucks on equipment, increases both the quality of press pictures and portrait shootings with excellent results under any lighting conditions.