I'm very late to this discussion, but for future reference, I'll chime in. One negative to the AC3 is if you use a Sekonic light meter with the PW flash triggering. The light meter will not trigger the pocketwizard if you use the Mini/Flex with the AC3. With the SU-800, it triggers fine. Not the end of the world if you use the delay function, but if working on your own, you need the light meter on a stand or the model to hold it. The newest touchscreen meter, L-458DR I think, works with the AC3, but it's very new and not worth it to me to downgrade from the L-758DR. Good luck, and tell us of your experiences.