I own and have owned several different camera's and this one seems to have worked the best for me.
It set up pretty easily and the software kept me pretty entertained for a while (making stop animations, videos, setting up the motion sensor).

As for the actual performance it works remarkibly well for everything I've used it for:

It takes clear pictures with good colour at 640 resolution.
Makes well focused videos.
Is compatible and works well with all programs that support webcams I've found.
Even works fine when it's completely dark and I'm lit only by the monitor, (infact turning up the brightness makes people think I've actually turned on a light and doesn't sacrifice quality too much either).

The main downside is that recently the piece it swivels on has become a bit loose, and the weight of the cable therefore can make it hard to position.

Although seeing as I've knocked the webcam off of my monitor on to the floor at least a dozen times I can't really blame this on the cams construction.