Great thread, I just stumbled across it.
I have two bikes; a Serotta Fierte iT and '08 LOOK 585. Both 48-49cm and both very light. I generally ride one for three for four days and then switch to the other. However, for the last three weeks I was only on the Serotta as I was doing some upgrades on the LOOK. So, when after three weeks I switched over to the 585 I think I actually smiled for the first few pedal spokes. I could tell immediately that is was lighter, smoother and more responsive. I love them both but I REALLY LOVE the 585. And I always keep my eyes out for another XS Optimum in any color other than black.
