Your point?
Yes, there are two 'flavors' of the 600EX - one with radio triggering (-RT) and one without. Availability is geographically restricted, so in some markets only one is available. For example, in the USA only the -RT version is sold (or at least, that's supposed to be the case - someone reported ordering a 600EX-RT from a 3rd party seller on amazon.com, and getting shipped a 600EX non-RT - meaning ripped off, since they paid for the -RT and got a grey market item lacking that feature instead).