I have the C spec in my car. 400RWKW, has been in the car for the last 6 years. Trackdays, hillclimbs and one DECA plus just flat out disrespect for the thing and it feels no different to the day I got it.
I have the Nismo slave on mine also. Some people swear black and blue that you cannot run the Nismo slave with these clutches..... I have and I wont be changing. Do it, you wont be disapointed!