That's odd, I emailed them a few days ago and this was their reply on 21st February:
You do not need to register the product. You will need the proof of purchase to show that the unit is in warranty.
P.S. Just been to the Warranty Registration page and there is no text entry box on the top line for Product Description (Model Name). As this is mandatory there appears to be no way to actually register at the moment! Oh well!
...or track us down in the dead of night and drag us off to darkened places to punish us for messing about with their boxes and decrypting HD recordings and programming them over the internet - we'll be loaded onto an unmarked container and shipped off to Korea to work in their factory picking up the tiny little blobs of solder off the floor and forced to eat raw freeze dried noodles until we reveal the true identity of agent af123 and where he lives.......