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I'm thinking they work like very large harmonic balancer. My guess to the efficiency increase comes from absorbing the energy in a spring which is able to return it to the drive line. In a harmonic balancer the energy is absorbed by a hydraulic system or an elastomer damper.
I am guessing due to their cyclic working, the springs fatigue & break. Causing possible damage to the housings. It's like having to have your clutch replaced with expensive parts & lots of labor. Someone wrote that it cost him 1500 pounds-sterling, approx $2500, to have it replaced. Which makes a $900 clutch job look cheap.
Don
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