I bought the PB Soft Paint kit (with the DAS-6) and it's been ideal for the Z's paint... In fact I still use it. I'd recommend chucking in a black glazing pad if you're likely to be adding glazes, sealants or waxes by machine - I've also got the yellow last step pad too but I've found I tend to only use the black pad instead.
I'd also recommend chucking in the other Flexipads backing plate too, as I've found they do make a difference (you'll be all right with the standard backing plate, I just find these better).
Other than that, it's a great kit and offers plenty of correction for the soft Nissan paint.
The pads and backing plates are interchangeable to a degree - neither will fit the Rupes machines for example, and I don't think the backing plate will fit the Flex machines but the pads do (I think... maybe... helpful, I know!) but both will fit the Megs and the Das-6 Pro, for example.