I have one, and it's best suited for more intimate situations, like portraiture. A Sto-Fen may be better in that area, but do you really need a diffuser? A good modern flash is a truly amazing thing on its own. My 430EX rarely needs diffusion, particularly is there's distant bouncing involved.
Oh, and it's stupidly expensive for a piece of Tupperware. Check out the eBay stores for less expensive unbranded versions.
Oh, and it's stupidly expensive for a piece of Tupperware. Check out the eBay stores for less expensive unbranded versions.