I was pleasantly surprised with this bike. I was looking for something to keep in shape over the winter, when it's too cold to ride outside where I live, in Philly. On my road bike I usually ride 5 or 10 miles a couple times a week. Once in a blue moon a 20 or 25 mile ride. When I bought this bike I hadn't been riding much and was a little out of shape. Still, for this price I was afraid the bike would not offer enough resistance to challenge me. Surprisingly, I get a pretty good workout on this bike. I have been using it fairly regularly for a bout three months. I do about 30 or 40 minutes, get the odometer up to about 9 or 10 miles, and get my pulse rate up enough to work up a sweat. I do get the resistance up to level 8 but only for a maybe 5 minutes, I can't maintain that level for very long. This bike is not for avid cyclist, the resistance would not be enough for someone in real bike shape. For those of us just looking for a way to get a half hour cardio workout two or three times a week this bike will do the job. The ride is smooth and quiet. The seat was a bit uncomfortable, so I bought a gel seat cover and can do 40 minutes on the bike comfortably enough.