Klasse All in One (AIO) is the first part of a 2 step polishing system they sell. You are supposed to use AIO and then top it with Klasse Sealant Glaze (SG). However, AIO is a cleanser, and putting it on before the Zaino prepares the paint and creates a darker shine (in some peoples eyes.)
I recommend trying Klasse AIO and SG if you haven't already. The only problem is that it's acrylic based and you will have to reapply/up-keep it every 2 weeks or so, unlike Zaino where a few coats will get you 6 months.
Definetly check out
www.autopia.org if you've never been. Their forums are a wealth of information, plus the "Learn" section is full of info. There is even an e-book you can download that is very insightful.
Peace