The Roubaix is a GREAT bike. I got mine in the summer of 2006 and have about 6,000 miles on it now. It started out as a 2007 Comp Triple, but there was a minor frame flaw. Specialized replaced the frame with a 2006 Roubaix Pro frame; that frame new cost more than my whole bike!
I love the bike. You ought to go ahead and go clipless right away. Years ago, I rode a Fuji steel bike with clips, but recently only a hybrid with platform pedals. Getting used to the clipless was no big deal. They put it on a trainer for me at the LBS and I practiced a few times. I've never fallen because of the clipless pedals.
Get some miles on that thing! My first tenative ride was 7 miles. It was really easy to work up to 25, then 50 and then a metric. About 8 or 9 months after I got the new bike, I did the MS 150--75 miles a day for 2 days. No problem. Right now, I do 25 miles Tuesday and Thursday before work and then usually a 50+ mile ride on Saturday. I just wish I could ride it more!
Take care of that bike and it will last for many, many miles of fun.
John