The only problem with the Zaino quick detailer is that it comes in very small bottles. You will find that you are going to go through a bottle rather quickly, especially if you're not fortunate enough to have a garage. This is why many of us like to buy gallon sizes of quick detailers such as Clear Pearl, Show Off or Meguiar's Final Inspection. A gallon will last you a long time! You can then just use the Zaino quick detailer just before you apply a coat of Z-2 or Z-5.
Or, if money is no object and you feel as if you have to use the Z-6 exclusively, then go for it. It's just pricier to do it that way. Laters