I've used both the FTG and AIO with FMJ. The final result felt slicker and looked a slight bit darker with the AIO, and application of the Klasse was easier than the FTG. I'm willing to bet anyone would be pleased regardless of which one they used.
FMJ is neat stuff. Easier to apply and remove than anything I've used, and looks awesome. After about a month it seems to lose a bit of the initial slickness (or so I've noticed, maybe Anthony can chime in on that one,) but it still beads as well as Day 1, and it doesn't look like any protection was lost.
There's some pics on page 3 of my cardomain site (linked in sig) if you're curious about the results on my car.