two-pieces with the right hardware also help to prevent heat from transferring from the rotor to the hat to the hub to everything...
and as far as a pad 'sucking'.. its pad choice... the more aggressive the race pad, the more it will eat rotor if they are not up to their correct operating temp.. this goes to the 'squealing' on the street too.
and if youre not seriously racing there is a 'cost to longevity' factor... if one piece rotors are $200 and you get 5 track days out of them, it beats the $500 rings that make it 10 track days.
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... needs more NOS.
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