I use one of this type diffuser in shooting macros. Mine is made by Lumiquest and I believe that the others are Chinese copies of that rig.
IMAGE LINK: http://rpcrowe.smugmug.com …09200196&k=DnbUE&lb=1&s=A
It works quite well because at that distance it is quite a large light source.
However for all other shooting, I will bounce using a Joe Demb Flash Diffuser Pro on my full size hotshoe flashes (550EX, 430EX and 420EX) and will use the Joe Demb Photojournalist FlipIt on my little 270EX.
www.dembflashproducts.com
The FlipIt and the FlipIt portion of the two-part Flash Diffucer Pro is adjustable and can be used at a 45 degree angle forward when shooting outdoors or in venues in which the ceiling is too dark or two high off which to effectively bounce.
I really like the Flash Diffuser Pro. I have no financial connection with Joe Demb but, his website links to my portrait gallery shot with a 550EX flash on a Stroboframe Camera Flip Bracket, modified with the Flash Diffuser Pro.
The link is: SmugMug Examples By Escondido Photographer Richard Crowe
I also have a Stofen and since I got the Demb units, I use the Stofen as a container for my AA flash batteries...