A couple of weeks ago I bought two Yongnuo 560iii flashes and the 560Tx transmitter.now I have had a chance to use them I thought I would write it up. The main reason for buying these was to be able to remotely control my flash power levels. The 560iii flash has built into it a radio receiver capable of receiving instructions more than just when to fire. It can receive power and zoom adjustments from the transmitter. The transmitter has an LCD screen and can control power and zoom for up to 6 groups of remote flashes. So how does it work? It works well. The flashes are easy to operate after a little reading of the manual. The manual is brief and written in a very strange language that shares only occasional phrases with English but it does the job. The transmitter is also easy to use after a quick read. Setting up the system requires pairing the transmitter with the flashes. This is no harder than Bluetooth pairing. After that, just set the firing group on the flash and everything works very easily. In operation I have so far kept to simple use. Having set up the flash on a stand with an umbrella I can walk away. If my exposure is not correct I can change the power setting without having to move either myself or my lights. I can also turn groups on or off entirely to test what effect each light is having. And it all works. I haven't done a long distance test yet but I haven't had any misfires at all. The only criticism I have is that the sprung pins on the transmitter hotshoe foot are a bit tight. It can be tricky to get the transmitter into a hotshoe. This can be solved though by using something small and flat to push the pins in as it slides into the hotshoe. So far then, a good buy and an absolute bargain at £65 per flash and £30 for the transmitter.