My personal opinion - skip the Z1 and buy ZFX. ZFX acts as an accelerator so you don't have to wait hours (or even more than a few minutes) to take off the Z5 or Z2. No need for Z1 if you use ZFX.
I also happen to be a big fan of Zaino leather cleaner and treatment, glass polish, clay bar, and (especially) the tire and rubber treatment. Much better look than Armor All, and doesn't attract dirt.
My $.02