Behringer CMD Studio4A 4-Deck DJ Controller

I read Phil’s review and he mentions more about the three modular devices rather than the actual controller and while the overall review is positive there are perhaps a few little things to be wary of.  I use a behringer uca222 with Mixxx at the moment and have had no problems with that configuration (although I am really new to djing and finding my feet).   The behringer hardware is quite rugged.  I also have a behringer xenyx mixer and a guitar amp modeller, again all pretty rugged.  It appears that this contoller has all the features and more of professional gear but it appears very low cost.  It has a 4 output soundcard and 8 hotcues on each of the four decks, which seems over and above other decks that are considerably more expensive.  I just wondered what the difference in build/features was compared with something like a traktor S4 mk 2, which is 315 dollars compared with over 1000.