Ordering the entire line certainly will get you first hand knowledege as to whether or not you like it.
I could tell a few stories as well but instead I will offer up a suggestion. Prep your vehicle the best that you are able. Get the paint into the best possible condition because the Zaino line will show the flaws. Once the prep is done right put the product or products that you will be using on thin. An ounce of product will cover a car three times with some left over for wheels and windows. If you run out of product you have put it on to thick and are wasting product.
KAIO is a good cleaner wax and also will replace ZFX if you choose to apply just one coat, either Z-2Pro or Z5-Pro. ZPC Fusion is also very good at cleaning up minor swirls and paint correction. I am sure that the website will give this to you as well but my order of application after prep would be...Zpc-Fusion,
KAIO, Z6 wipedown, Z2-Pro, Z8 wipedown. I have CS but am not a proponent of it yet. I am still in the testing stage before I give an opinion. Other than to say it simply is easy to apply.
Oh, one last thing...you know what they say about a story ....You can tell it any way you want to . It is your story.