I bought that very same bike earlier this year and have put on about 1400 miles so far. The shifting was noisy and clunky for the first few hundred miles as shifting cables stretched and settled in. After a tune up at the bike shop at that point and then learning about the shifters and additional tweaking on my own, everything runs very smoothly and quietly. It also helps, I believe, to soft peddle as you shift. You can go up or down several clicks at a time. As said above, get the bike shop to provide some instruction.

The stock tires, while giving a smooth ride, began to wear out quickly. I bought 28mm tires and a new wheel set to provide a softer ride to deal with a troublesome back. At this point the bike is exactly what I was looking for but learn how to tweak and adjust things. It is actually very relaxing to tinker with the bike.