I am the happy owner of a few of the 600Ex-RT and an ST-E3-RT.
My wife keeps buggin me that there is not enough light in these "pocket-flashes" (her term) to do some serious portraits.
I beg to differ that this is of any importance, especially as I/we now use the 5DIII with a 100 Macro 2.8.
When i read that a monolight Elinchrom offers HUNDREDS of Ws when required, i wonder what a similar Ws-rating would be for the 600ex.
It's probably closer to a 60 watt bulb than a supertrooper.
Does anyone know?