Advantages:
Consistent performance under design loads
A wide range of load/deflection characteristics
High load capacity with small deflection
Longer fatigue life
Space savings high load to size ratio
Inherent dampening especially with parallel stacking
Flexibility in stack arrangement to meet your application
Application:
Vibration isolation etc 
Machine tool clamping components 
Boiler suspension systems in power station
Safety valve 
Overload protection in electric transformers 
Couplings
Safety brakes for lifts and elevators 
Brakes for construction and railway vehicles 
Backlash compensation for ball bearings
Automatic transmission 
Overload clutches
Clutches, etc. 
Adapted to the specific installation requirements in clutches/gearboxes