I did 1500 miles on my 2010 CAAD9-5 before having a professional fit. I'm glad I waited that long because I wanted to establish riding habits (how fast, how far, how long, how often) and also really get to know my bike. After all my little adjustments here and there I was STILL 3cm too low on the seat and using a completely wrong stem. I was so much more flexible after the 1500 miles that I'm glad I didn't get a professional fit right away.