Ive been browsing for some time for a media centre remote and found surprisingly few options that seemed up to scratch for a reasonable price. Then found this remote and its truly fantastic, quick and responsive and since its wireless, not infrared, great reception anywhere, have had it operating at around 8 metres.
I can confirm that it works with windows 7 media centre also, i'm running the windows7 rc and the remote works great with all the functions of media centre. Ive also tried using it for windows media player, since the two use the same base processes it also works, for example you can pause/play and select songs/videos etc. However functionality is a little more limited, not due to the remote but rather the interface, media player just isnt designed to be used with a remote. So while you can navigate around using it, play/pause, adjust volume etc, not all functions can be accessed with the remote.
But for windows media centre this is a fantastic device and well worth it for the (comparatively very low) price!