Ok girls...I've just about made my mind up about what bike to purchase. I've test ridden quite a few bikes & really wanted to stay local (Specialized, Fuji, Pinerello, & Trek to choose from). I tried several WSD, but they all seemed too small. It's between the 2011 Tarmac or Roubaix SL3 Experts. I'm about 5'5 1/2" & the 52cm fits fairly well as far as I can tell. They've allowed me to test ride them both this weekend. I'm going to ride this afternoon again. The Roubaix was very comfy, but the Tarmac was a freakin' RACE MACHINE! I love it. My question is how would it be for hills (& I mean TX hill country hills not CO mountains). Also would a century be ok to do on the Tarmac? Still confused, but at least I'm getting closer. I'd like to order it Monday, so I've got to decide by today. Sqeeeeaaal...I'm so excited. I've been saving for this thing for months & months. It's finally time.