Took my RadioPoppers into the jungles of Pahang over the weekend and they absolutely rock! One time, I had them on two lightstands at a distance of 400 feet and they still worked flawlessly. With e-TTL to boot! They’re so awesome I’ll be getting another set next month plus a pair of 580s to go with them.
For me, range is not that important, well, anything up to 100 feet is good enough for me but e-TTL is. The ability to have exposure control plus the ability to remotely control the slaves is important. However, more importantly, reliability is the key. The existing Canon wireless system is too dependent on line of sight and is quite easily confused when in bright areas, especially outdoors. I even had problems one time I did a portrait shoot where the left flash unit was fired through a translucent reflector and the right-side flash was bounced off the right wall and ceiling and one of the flashes wouldn’t go off 100% of the time. I shot forty frames with that configuration and ended up with 9 frames where one of the flash units did not fire properly. This is indoors with a full height glass wall on one side. Maybe the infrared beams went through the windows but who knows.
In a wooden shack building 40 feet by 70 feet, I had 100% trigger rate no matter where I placed my two slave flashes. I had them outside the building firing through the side windows, left and right of the main hall, anywhere basically and all seventy frames fired successfully!