I've had a Krieger on mine from about 7,000km. Changed the chain at 26k, but i figured most of the damage was done in that first 7k with a crappy tensioner. So I got an extra 19k of abuse before it had to have a new one.
Rattles from cold as per instructions, but at operating temp where it really matters, the cam chain is always under full control. The tensioner can't back off unless the locknut is loose. Nice.