I'm wondering if anyone has had experience using the Einstein with Speedlights. I'm thinking I will either need to use a PC sync cord for the Einstein and RF wireless for the Speedlights. I'd love a shoot-through wireless solution which I can mount on my camera which controls the Einstein and then have the 600EX or ST-E3 mounted on top. Has anyone attempted that?
If you're working indoors, you can just toggle the optical slave sensor on the Einstein so it triggers on the 600 EX (E-TTL pre-flash turned off, of course). When I'm at home and I need to take a quick product shot, I often just throw a 580 EX II on my camera instead of breaking out PocketWizards or the 12 foot pc-sync cord.