Zaino is perfectly good stuff. I use it and like it.
But since people get a little crazy about this stuff, it's always good to remember that the exact brand is usually not the limiting factor.
Most brands (not counting super cheap Walmart crap) will make a car shine as well as you could wish, most of the time. Most of the time, the limiting factor is time, skill, and dedication of the detailer.
Which is a way of saying I like Zaino today, but would also happily use something else if Zaino went out of business.
BMW CCA Member