Adamah, thanks for asking. Well so far, I'm pleased. I've mentioned this earlier but Zaino preserves the original color of your car much more so than the Klasses SG. I love the way a few coats of Klasse looks on my car. The problem is that it turns my silver-grey car into a true grey. I wanted to try something different and the Zaino seems to be working quite nicely. My car is a very nice color and it shines very nicely. I would highly recommend Zaino for a silver or white car. As for smoothness or slickness, I think Zaino is a bit better. Part of this is a result of my recent claying though. So this is difficult to gauge right now. But so far so good.
Some problems though. I've noticed that a few spots on my car are not smooth at all. I've tried many things and have asked a few regulars here via personal email. Two have told me that they've gotten similar results. I'll probably follow Brad B's advice and reclay those areas again and do the initial Z-1 and Z-2 coat again. The frustrating thing is that I was very careful in the initial Z-1 and Z-2 combo. I know for sure that I could not have missed those spots. I even applied it thicker than most Zaino users do.
All things considered, it works quite well on my silver color.