I have been comparing the Meguairs NXT and the Zaino. I put NXT on my E90 (3 months old) and Zaino on my Honda 7-seater (6 months old). The Zaino stuff is really amazing!
The Zaino treated Honda has a much better shine then my E90. Also when you feel the surface, it is still very smooth after weeks.
Since it is very difficult for me to order the Zaino in HK, I can't apply it to my E90 before some arrangement to buy in the States. Anyways, it is worth the effort.