Oooohh The Holy Grail of flash triggers :) All the goodness of Nikon iTTL/CLS but over radio from #Yongnuo
, for less than the GDP of a small country. They work like a charm too. The user interface is marginally easier than the Nikon one - and I didn't have to look in the manual to figure out any of it - my guess on how something worked, was what the designers had chosen - every time. Some really nice touches are adjustments in full stops or thirds using the up/down and left/right buttons respectively; you can control the zoom of each group from camera (as the flashes think they are on the camera) - nice. You can mix modes - iTTL, Manual and SuperSync with dumb old long duration studio lights - all in the same shot!
and the best bit? You won't need to sell your granny - the normal transceivers are £25 each and these dedicated TX units are well, a random amount of money right now. I paid £50 for mine from EachShot in Hong Kong. They are now selling them for £150. Other ebay sellers in the UK are selling them fro £89. This is no doubt due to very high initial demand - and I reckon you'll see them at £50 or less in a few months. Having said that - I'd have paid £89 for this: no problem.
One last thing - if you attach the supplied cable from the output port to the control port on your camera, you can take the pictures from any of the light transceivers!