I had the replacement clutch installed recently (<1000 miles) and immediately noticed an improvement. The replacement clutch still has some of the same characteristics as the original clutch, the difference being that the new clutch is significantly quieter in the 3-4K rpm range when decelerating.

 

I remember that even in my 00 S2000, the rattling got worse over time. So I would wait and see a few more thousand miles before passing judgement.

 

https://www.s2ki.com has a scan of the service bulliten.
here's the link to it. https://www.s2ki.com/images/serviceb054.jpg