I'm skeptical of all these fancy flash gizmos.
I they are so great, why doesn't Canon or Nikon offer them as an option?
Instead, both Canon and Nikon *do* recomend use of a bounce card, which is built-in to both the high-end Canon and Nikon flashes. For the low-end models, you can make a bounce card with a white index card and a rubber band.
The 3rd. party flash options remind me of fancy fish lures, designed more to attach fisherman than fish.
-Paul