FYI If your vehicle is standard spec with little or no performance modification you SHOULD fit original Clutch and DMF.
Solid Mass Flywheels (Single Mass), are designed for applications where the specification has changed, something people dont appreciate is that the DMF is designed for a specific torque tolerance range, and once you break that tolerance range it breaks down. Also if you dont service and maintain your vehicle correctly the DMF is guaranteed break down because it isnt designed to take all the extra torque and power provided by modifications (PD Engines are common for this, due to injector carbon deposit, causing increased vibration damage to the flywheel and ultimately causing the spring-sets to become coil-bound.
Moral of the story:
Single Mass Flywheels are only effective if youre putting alot of additional power through your vehicle. They do however have some nasty side effects because they dont dampen as much tortional vibration as the dual mass (Snapped Crankshafts are very common on SMF).
Dual Mass Flywheels are effective if the vehicle is standard - they will fail due to: Poor driver ability (flooring it when cold, sitting on the clutch at traffic lights, slipping the clutch etc), Poor vehicle maintenance.
Sorry for the verbal vomit, but people need to know the full facts IMO before they end up snapping costly components.
Thanks
Jake (Btw i work for ZF/Sachs).