I've used Zaino for a long time, but I only use it on one car...I got it specifically for a family member's car that I take care of but don't see that often so I wanted something that had the best durability and Zaino seemed to be the thing at the time.
I will say it beads like no other and does seem to last a long time. The Z-CS is easy to put on but it doesn't bead like the regular Zaino "polishes", although the durability of it seems pretty good. IMO the ZFX is definitely worth using, and the Z-8 is just a fantastic product. The tire dressing is very good, and lasts a long time, although I think there is a newer version than the one I have. The Z-PC is a very nice mild polish and it works really well on paint transfers...I have a lot of problems with the Z-AIO, you need to use a very small amount, and it was apparently intended for hand use, which is perhaps why it doesn't agree with me if I use it by machine. The wash is very nice and does seem to extend/refresh the sealant.
As to what happened to the Zealots...I think back years ago Zaino was really a superior product in many respects, and people who tried it found that and wanted to tout it...so much that their zealotry appeared cultish and turned a lot of people off (including me, at one time I refused to even try it because of the "cult"). Of course there was some snob appeal in the way it was marketed, too. IMO part of the reason the zealotry has died down is because wow, there are really tons of good products out there now, and if you perceived Zaino to be the best, there's much less of a gap now than there was. And, let's face it, a lot of what goes on here in the detailing forum world is hype and flavor-of-the-month...and the last "What's New" entry at the Zaino site is from over 4 years ago...just no Zaino buzz going on.