Just a heads up for those purchasing this new flash from Amazon.com. You may get the "non-US" version 600EX (without the radio transmission function). I understand that the EX is not to be sold in the US, but Amazon is allowing their partner sellers to bait and switch!
My order was through Amazon, but since they did not have it in stock, it was offered by several other sellers, in this case Big Value. All orders and invoices indicate the 600EX-RT, but the item shipped is the non-US (no radio transmission functions).
This is a friendly reminder to avoid the frustration I am going through! I am sure that my experience is the tip of the iceberg...Big Value is probably shipping many of these to other unsuspecting customers!
The Amazon help line, is completely unresponsive- their answer was essentially you have to deal with the supplier, it is not our problem.

