I Have been a traktor pro user for years using a variety of timecode and midi controller setups. My audio 8 and s2 mk1 were starting to have issues after years of use so i was looking at replacing both units.
When Traktor pro 3 was announced the feature that really got my attention was that you no longer needed a native instruments audio interface to use timecode vinyl. When the s2 mk3 was announced as being bundled with 2 licenses for a full version of traktor pro 3 with timecode functionality this seemed like a great value bundle.
Controller:
Simple non cluttered layout, huge improvement with the Jog wheels, larger and very responsive. fun for basic scratching. non symmetrical deck layout is a nice touch. RGB performance pads give great visual feedback for hotcues and loops. all knobs, faders and buttons seem to be where you would expect to find them, pitch control surpisingly accurate for the size.
The mixer effects section and lack of separate effects units/controls at the top has had mixed reviews, my original plan was to simply re map if needed, and thats what i did. If you have a good understanding of mapping and modifiers then you can tweak the effects section to your own preference. works well with other midi controllers as well, when used with my zomo mc1000 ive every control i'm going to need.
Software:
Great software, has worked flawlessly with different setups for me, Timecode vinyl works with my american audio versaport and my m audio connectiv, low latencey with both interfaces.
if you have an existing audio interface that you will be using instead of the s2 then you can use it with windows 7 and just use the s2 as a midi device, just make sure your interface has a headphone monitor
Summary:
huge value for money without a cheap looking product. Not being locked into native instruments audio interfaces for vinyl control is a welcome new feature! Reading the manual is advised to get the most out of the software.