I would highly recommend getting fitted professionally for your bike. I drove 75 miles and paid $50 for a bike fit. My bike was purchased online, I knew the frame size and crank length was correct. I had to replace the bars (2cm to narrow) the stem (5cm to long, wrong angle for my type of riding), and adjust the seat and saddle position. The full bike fit took two hours, that included two test rides, and all the adjustments. Well worth the money! The difference in ride quality is amazing. With just a few minor changes, I was able to increase my avg speed, and daily mileage with less pain. Well worth the $120 I paid for the fit, and all change needed changes.

TT, Your LBS has a good policy, a few of my "local" bike shops only allow 15 minute rides. One expected me to buy the bike after riding around for 5 minutes in the parking lot! My PBS (preferred bike shop) is 18 miles away, but they let me take out bikes for hours at a time. You can bet i'll buy my next bike from them.