Reply to Questions about the Denon Dn-s3700 with Serato and Traktor.

So i just bought myself some denon dn-s3700's, but i havent bought a mixer yet. I want to use the denons with traktor scratch pro, mainly because i all ready own it. But if there is no easy way to get everything to work without timecode then ill look into scatch live.
Here is a video that shows two dn-s3700's working in traktor.
http://www.youtube.com/watch?v=hYxVndiKxLQ

Now the question is, do i need to buy the Dn-x1600 to use my s3700's in traktor without timecode.
-How well do they work in traktor?
-What are the benefits of using hybrid midi mode instead of timecode?
-How hard is it to get midi mode working on either traktor or serato scratch live?

-Thanks for all the help!