Originally Posted by
NormanF
That's the point. If you like the Madone, buy the Madone! Converting it is pointless.
Nobody is converting it but Trek. You buy the 7.7fx... done deal.
As to the OP's question, I think drivetrain and wheels/tires make the most difference in feel. Especially tires. But having converted my 8 speed to 9, I can tell you that it makes a difference also. 8 speed parts are generally heavier across the board.