As per application, Klasse AIO applies very easily and removal is the same. Klasse SG, on the other hand, must be applied in very small amounts or it will be difficult to remove. Some people have shown up to meets with Klasse SG still on their car.
Durability is about 6-12 months. If applied correctly, one coat of Klasse AIO topped with Klasse SG should endure for 9 months at least.