I've ridden my friend's Roubaix and I wasn't too impressed. Compared to my R3 it has a "dead" road feel. There are other "relaxed geometry" bikes available that get the job done just as well without looking so goofy. I mean do you guys really think the Roubaix looks good? I personally think it looks silly.

Cervelo R series, Cannondale Synapse, Look 566, Colnago ACE, Bianchi Infinito....pretty much every manufacturer these days offers a relaxed geometry performance road bike. You don't need gimmicky Zertz or ridiculous tube shaping to achieve a more upright, comfortable position. In fact, the Tarmac still has a relatively long head tube and should be more than comfortable enough for century rides with the right handlebar/stem position.