As BulletVI, it depends on your computer (horsepower) and what Fraps is showing as the recording frame rate. To get some of really good quality, aim for 50+ FPS when recording (when the FPS counter turns to red). If it drops in the 30's or lower, I recommend playing back at 1/2 speed in the film viewer and recording with Fraps. Then in your Video Editing software double the speed of that clip.
So if your computer kind of chugged during a segment and say got 25 FPS (which will look jerky), if you did the trick above, you'd essentially get 50 FPS and avoid the jerky video.