I got the show kit plus their ZPC. It's good stuff from what I can tell, but it's the only stuff I've used so far, I also got some P21S Carnauba and put a layer or that on top. I did a 50/50 with tape, and literally couldn't see a difference with the Z5 only side and the Z5 plus P21s side. I dunno though, that could be my noob detailer's eyes.
The ZPC really needs at least an orange pad. It didn't do anything on a white pad. The stuff was really really dusty too, but I think I was using too much. Also I've heard it doesn't work too well on German paint. Or any of the ceramic based clearcoats since it's water based.
Another thing is that it really brings out the defects in the paint if there are any, so some good paint correction is really recommended before putting it on.
I hope that helps, but I'm definitely going to be trying other products as well. Can't wait to get my hands on some
Menzerna.