That is the same bike my husband recently got--and the 04 model, too. He loves it.
I have always had shifting 'issues' with my Jamis Aurora bike, though it was better after I just had the drive train replaced after 2 years and 5000 miles. Till yesterday when I had the worst chain suck I ever experienced. Luckily I carry a grease rag.
Smooth shifting is my priority, too, that's why I want to upgrade to Dura Ace components. And I like the fit of the Roubaix. It is hyped as for speed and distance, which is what a want--to be able to do century rides, but not left behind in the dust.
I know I will have to find a new seat, the one on it is just plain nasty. (I know, I know, see other saddle threads...)