Excerpt: Radio controlled wireless flash is the only way to go in my opinion. It opens up all sorts of creative control. The ST-E3-RT paired with 600 series Canon flash work as they should, seamlessly and share identical control layout for a powerful and very customizable system.
Excerpt: This is essentially the 600EX-RT without the actual flash. If you're going to use the 600EX-RT off camera, which is what they're really for, this is something you should consider purchasing. You probably don't want a flash firing when it's attached to the hotshot in your camera.
The key to unlocking an entire GALAXY of possibilities
Tibidor, B&H Photo
10 June 2015
Excerpt: This thing is remarkable. I have used it to trigger my strobe in some mighty bizarre and otherwise impossible locations for landscape, architecture, portrait, street, and even wildlife photography.
Pros: Durable, Easy To Use, Lightweight, Long battery life, Reliable
Excerpt: Yes, it works pretty well - demanding shoot for it with the 600s poked around corners over a reasonably large area. Would say Canon got it right this time as with the 600s. The screen on top is just fine. Doesn't work with Olympus OMD EM1 with the hot shoe blanked off except central pin.
Pros: Easy To Pack, Easy to Use, Lightweight, Reliable, Works
Excerpt: The surprise is that despite Canon writing that the High Speed Synch won't work and that the highest normal synch speed would be one-half of the normal synch speed, the set up with two 600EX-RT works so far without a failure using either the High Speed synch or the 1/250 normal synch.