I have a Giant Sedona ST - bought to supposedly free myself of the problems of cheap department store bikes. The problem is that I have FAR more problems now than I ever had with my cheap bikes! Mainly shifting. Currently, the rear derailleur will not shift into 7th gear, at all. I took it to the LBS where I purchased it, as I have several times over the year and a half that I've owned it, and their answer was, yet again, cabkle tension. They tightened the cables and sent me away. I tighten the cables myself, often. It *may* work for one or two actual gear changes, then it goes back to not shifting. Also, it seems that if the cable is really tight, that also keeps it from shifting into 7th. Is there anything else I can adjust?