The camera is an import, and as such may be branded Rebel T3i instead of EOS 600D. If you order from the digitalrev website (as you have linked) then you will not have to worry about import duties at al (they are covered) and they also do offer a local warranty service for you to send your camera to should it break (as you noticed).
Some people are funny about ordering imported cameras, etc but to me in this financial climate I dont see any reason why not to make a saving like this where possible especially when you have companies like digitalrev accounting for the import duty and local warranty.
I received my Speedlite 600EX-RT from them this week, and I couldnt have been happier with the price and service. That price for the kit seems very very reasonable. I say go for it!