When I was in Vegas for the PMA show, I dropped my 550EX flash on the floor and it quit working. When I got home I sent it in to get fixed. In the meantime I bought another one cause I can't be without. Plus, since they can work together as master and slave, it opened up new lighting opportunities to me.
Five months later (Monday) I finally get around to trying them both at once. The 550 flash on my right was fired via a PocketWizard radio slave and the one on the left was set up as a slave to flash on the right. After a lot of messing around trying to get them both to fire (no user's manual), I finally got them both to sync in manual flash exposure mode.
I'm psyched! I'm not saying these photos are masterpieces. But the opportunities this opens up to me are huge. I recently bought the annual Transworld Skateboarding photo issue, and I'm inspired. Skate photographers do some of the most creative outdoor lighting and sports photography and a lot of them are using multiple flashes and gels to sculpt a photo. Me too! Me too!