i've got the VCI-300 and it's very easy to use with traktor - look for robinkirchoff's mappings in the controller mappings section and itch is lots of fun to play around with and intuitive (although a bit basic).
however bear in mind that it's a bit of a waste of money to buy the VCI-300 and use it with traktor - you'd probably be better off buying a VCI-100 and an audio interface (NI audio 2 DJ should be fine for starters and has a much better output quality than the VCI-300's internal soundcard) - the VCI-100 also comes bundled with traktor LE which gives a cheap upgrade path to traktor pro.
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