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I imagine I'll eventually buy more as well. I have a 540 and 360 and have used them wirelessly a number of times, but have recently been limited by objects blocking the camera's and flashes' communication, so I needed something else. I think these will work great, and I still frequently use my trusty old Vivitar 283 with an extension cord for off-camera lighting.
Thanks everyone for a great thread with lots of good information.