Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Glowing is about it

I think the other reviews have it nailed - on the Mac it is of minimal usefulness - even as a volume control for iTunes, it ONLY works if you have iTunes in the foreground - which is an unlikely situation - usually you'd want to adjust volume or mute iTunes playback (i.e. for a phone call) when you were working in another application. If you have to click on iTunes to bring it to the foreground, why not just click on the control to mute.On XP, as other reviewers have noted, the driver is buggy and hasn't been updated since 2004. If you are lucky the PowerMate will work for a few minutes - usually it does nothing at all in any application (oh - except glowing and pulsing!). Completely useless.The Keyspan digital media and iTunes remote controls ARE able to control iTunes in the background - on both Mac OS X and XP - and they are what I use now in place of the useless PowerMate.