I noticed in the pics of the new SP600 it didn't have the same front hubs as a SP500 or like my old Mag did is this a different 4X4 system and if so is it better??

 

Same principle as the older 2 hub design but now everything is in one neat package. Fewer areas to leak and take care of and the intermitant 1 wheel lockup put it in reverse and go forward again is history. IMHO its a very good improvement.