It finally came today! I loaded it up with 8 batteries and hit the test button on my 580EXII a few times to see what I was dealing with. Wow!!! At 1/1 recycle time is about one second. At 1/4 you can pretty much keep hitting the button until either your thumb is sore or you burn out your flash! I can't wait to test this in the field. I REALLY could have used it over the weekend as I was shooting a wedding but I knew up front that shipping would probably take forever :-(


I'll write another post once it's been through the paces.