The way it rides, as a frame material, compared to alloy, steel etc. geometry, climbing and descending capabilities, the fantastic thing about carbon as a bike material is being able to mould & layer it in different forms to increase strength in certain areas, reduce in others, alter the handling and ride comfort were required and still retain exceptional lightness, that bike weighs in at 17lb but you could chop that back with a lighter wheel set and components.
I've raced on, steel, alloy and carbon/alloy frames over the years, its all down to choice of course and what you want from a bike but when Carbon first hit the streets it revolutionised the bike industry.