I needed a Skype webcam for use with a Mac Mini and this does the job perfectly. I plugged it into a USB hub and it appeared in the Skype preferences. It also works with Facetime and Quicktime Player as a recording source. Image quality is sharp and clear, about the same as the iSight camera built into my MacBook in daylight, and a bit better than the iSight camera in artificial light, producing more natural hues.
There's no microphone, and no clip for attaching to a monitor. It has a flat base on which the camera head swivels, quite a long USB lead (about 2m), and some non-slip material on the base. When the camera is active, there's a glowing green ring around the lens. There's an Xbox logo embossed on the front but you have to look very closely to see it.