Just tried Fuzion on white Mazda Miata and on dark green Mazda 626.
The Miata had been clay barred, and buffed with paint swirl, then Zaino with Z-2. I just put Fuzion on top of the Zaino, and felt there was a noticable improvement in the depth of shine, which is difficult to achieve on a white car.
I clay barred and buffed the Mazda, which had been Zaino-ed about 2 years ago. The car came out beatifully with a deep rich reflective shine and no spider webs. I did three coats of Fuzion. I am satisfied with Fuzion. Zaino is very shiney, but Fuzion seems slicker with a deeper reflection on the first coat. I Also used Zaino Z-8 on top of Fuzion as a finisher, and that made the final surface even a bit slicker.
To me, Fuzion was easier to buff and takes less time and effort over all compared to Zaino. I believe Fuzion got it right, with qualities of polymer paint seal combined with C-wax.