I have a Dazzle and at first i was using Composite and the quality is not so good. Heres a Video showing Composite.
And when i got S-Video a couple of Weeks ago the Quality has improved by a lot. Heres a Video showing S-Video.
And as i hope you could see the S-Video is much clearer and better quality, you can really see it in the words, in the Composite the words are really blurry and in the S-Video its much clearer. And if you are going to buy a Dazzle i would highly suggest that you get a S-video cable it helps a lot.