A great addition to any controller set upArvosana 5/5
If you're looking to expand your palette - this is an essential piece of kit to pick up.
No one using Traktor should be without this. Not that it has to be used all the time, but the option should be there. There's lots of tutorial videos out there.
It's only downside is that it is bus powered and could use a couple more ports.
Catford Bones