I have a Trek 4100, and it is the best bike I have ever had. I have taken it to a mountain bike trail many times and it has taken a beating. The bike still is quiet as ever (though I have had to make a couple adjustments to the front derailleur after it was at the trail a couple of times), and I have had no problems except for the first seat I had. Something happened to it, and the company would not replace it. I had to buy a new one for $25, which isn't too bad.