I am indulging my inner Fred. I went and tested an '08 Specialized Tarmac last night wondering if I wanted to go on a 5 lb crash diet and switch my ride away from steel. I was surprised that although I could feel the lighter weight there was only a small difference in responsiveness. I did find the bike reflected the bumps in the pavement more - mostly due to the stiffness in the fork compared to my springy swooped steel fork. I think I would prefer the steel bike on a century. What I did notice was that the Tarmac was not as twitchy and tracked a little better. I would prefer that on a shorter speed/club ride. My current ride will need a new group next year or the year after - it's on it's last legs. I am perplexed. There are some fantastic deals on '07 bikes if you can find one. I am not a Shamano fan - the Tarmac expert comes with shamano ultegra. Stop me before I do something stupid!