I have to say that for Sony, this is probably one of the best (if not the best) wireless TTL flash triggers available currently. I did own the Pixel King for Sony at one point but it does not have individual group or ratio control straight from the transmitter – the changes need to be adjusted individually on each flash.
You can choose to set the flash groups to either A, B or C. The transmitter and receivers however, should all be set to the same channel for them to work together.
There is a light in the front to indicate whether the receivers are working. There is a jack at the rear for wired triggering of studio strobes as well (with manual control).
So the big question is – does it work?