I have decided to go with the Centerforce as I have had good luck with them. I have never had one that slipped, or at least I did not notice it. I recently swapped the stock flywheel for an SFI unit and do not want to set it in the parts pile. The street twin sounds like a nice clutch that will harness high horspower applications but overkill for a street driven car like mine. If it did not require a flywheel change I might have went for it?