I would say it's a great street clutch that NEVER slips but that is what makes it a bad clutch for a heavy drag car with good traction.There is another member here,Mike67net that had a major transmission failure just after he installed a twin in his drag car too.My new clutch has an adjustable plate that can be tightened up for the street and loosened for the track.The other issue I had with the twin was too much inertia for a crisp and clean power shift.With both of the discs and a floater in there it wont release quickly enough for a clean disengagement.
And no they don't rattle.
Gus