hi, I have one for 580EX and it works a treat. I need to use it at 24mm setting with +1 1/3 to +2 EV compensation and it is really superb for most macro applications or as a beauty dish for portraits. They only issue is the use at 1:1 magnification for glossy bugs. I think it is a nice saving over the dedicated ring flash.
I use one for both macro and portraits and I think it's excellent for both. For macro you can create a bit of shadow modelling by sticking card over parts of the light. And a big flash like a 580EX has enough power for portraits too. The only problem I have with it is that it's not very robust.
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