I've bought two EZRun's (5.5T and 8.5T), one from Demon99 you linked and one from this guy (
http://www.ebay.co.uk/itm/Ezrun-RC-R...item588f046fb4 ) there's a difference in visual aspect between the two. Demon99 packaging and manual seems to be lower quality copy of the original; both motors work, but I would go for "real" deal