Agree with Joseph - I'd start by asking yourself what main types of photography do you find yourself doing mostly (with the D600) and start from there.
If memory serves Rockwell's U1 & U2 are for Landscape and family/Portrait, fair enough. But neither of these are likely to be ideal for action or low light etc... So nail down your styles, remembering that APSM are effectively a third setup in addition to U1 & U2.
Initially I toyed with loading Rockwell's settings but then realized two main things 1- Action is one of my main photography types and 2- working up my own settings would be a much more useful exercise in learning the options in the D600's menus.
Why not give it a go and as Joseph says there's plenty of people here who would be happy to give feedback on specific menu items for various applications.