Wimp.

Sure, a Madone is going to ride better than 'an old steel beater'; but, REALLY -- are so spoiled that, not only do you feel like you're doing forced labor by riding a MTB, but that the act of 'shoe-ing up' to ride the Madone is TOO MUCH TROUBLE?

Is your chamois pink?

LOL, I HAD TO MESS WITH YA ON THIS, GIVE THE WHOLE 'MAN UP', 'PUT ON THE BIG-BOY PANTS' RAZZ, NO OFFENSE MEANT. I just did it because I ride a Kona MTB, 37-lb full-suss monster with 5.7" travel on each wheel, as a daily roller. My back demands full suspension, so more weight is the trade-off.

Personally, given my size and what I do on a bike, I'd be scared to BUY a Madone -- I'd be afraid I'd PRETZEL that sucker!